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order to arrive at the solution of questions relative to the shock of luids, he uses as a guide M. Gorges Juan, author of the Examen maritime already mentioned. - In the latter part of the section, he gives the general and rigorous theory of the motion of fluids, and shews the insufficiency of the ordinary integral calculus for resolving problems appertaining to this theory. The calculus essentially necessary to these problems is that of partial differences invented by Euler and D'Alembert. This calculus is so facilitated, as to be within the comprehension of young students ; and its equations are applied to the motion of fluids in tubes.
Section V. treats of machines, and of moving powers to which they can be applied ; considering the different physical circumstances that affect their equilibrium and motion. The mauner in which adhesion, friction, and the stiffness of ropes and chains, operate, is explained ; and the previous theory is applied to the force of men carrying, pushing, dragging, throwing, &c. and to the force of horses.
In the latter part of the volume, the author treats of the elastic fluid reduced to vapour, and of its application 10 the motion of machines. An account is also given of the discovery, use, and successive improvements of the steam-engine.
The Second Volume of the Hydraulic Architecture is destine.. to the description of steam.engines. Since the great perfection, lately given to such engines, has determined their constructo ors to employ only those of double effect, the different mechanisms and contrivances which preceded the recent discoveries are to be considered only as objects of curious research and erudition. As it was the intention of the author to step beyond the strict limits which mere practical utility might
prescribe, in order to point out the progress of the hum..!! mind from one invention to another, by the combination of ideas, he has given the details relative to the antient machines, and has disposed them in such a manner that the connection between successive improvements may be traced, and the value of each improvement appreciated. Since, however, the machines of double effect were the primary objects of this work, the ancient machines are treated only as accessory. To have presented a full description of each machine would have extended the work beyond all reasonable bounds: but sufficient particulars are given of these machines, to make manifest the relation between the old and the new, and to point out when the former are cnly particular cases of the latter. * By this method (says M. PRONY) the progress of the human mind will be traced, which commences with isolated ideas, previously to passing to general notions. It will appear that a machine of double effect, conveniently constructed, can, with the slight modifications of which its mechanism is susceptible, operate as a machine of Newcomen, or as one of those constructed at Chaillot."
In treating of steam-engines, M. Prony has adopted three principal divisions of objects for description and discussion. The first contains the detail of experiments, and the description of the apparatus used for determining the expansive force of vapour : some useful purposes are also mentioned, to which the results of the experiments may be applied in natural philosophy and the arts. The second division treats of the two systems of the steam-engine of double effect, in which the author endcavours to unite the different variations of which the combination of machines is susceptible ; and he has added the detailed description of the engine of Newcomen, and of those constructed since 1780 at Chaillot and Gros Caillou. Finally, the third division presents particular details necessary to those who wish to construct steam-engines ; and the principles requisite for calculating their dimensions and effects.
In concluding our account of this work, we must, observe that it is one of those which comprehend so great a variety and extent of matter, and require for their accomplishment so great a depth of knowlege, that we have considerable difficulty in believing them to have been effected by a single individual. We must recollect, however, that the pages over which we turn in a few hours, or which wę peruse in a few weeks, present the continued accumulation of many years passed in patient and laborious research :- but, if such a recollection withdraws us from the confusion of vague admiration, it will only lead us, in this instance, to a sedate, matured, and defensible approbation,
Whatever, indeed, is due to judicious selection and clear arrangement, to enlarged knowlege and nice discernment, to criticism which exposes error and absurdity, and to genius which points out the road to new truths, must be participated by the author of the present work. Few have sufficient comprehension of knowlege for all that M. PRONY has written : yet whoever consults his book, for information on any partitular subject which it discusses, will not turn from it unsatisful; nor complain that, to the ambition of variety and extent of matter, the author has sacrificed the nicety of detail, the rigor of prouf, or the curious discussion of fundamental propositions.
ART. IL. Histoire de Pierre III. Empereur de Russie, &c. i. e.
The History of Peter the Third, Emperor of Russia, printed from
different from those compilations which are hastily put to gether on the death of some great personage; and it is declared to be the collection of the observations of a man of talents and distinction, secretly kept by Lewis XV. at the court of Pe. tersburg, for the purpose of satisfying his curiosity respecting the private intrigues of that court: but its claims to historical excellence are so immaterial, that it might have been suffered to pass among the generality of those performances which are here mentioned with so much scorn. If by the Author of the Life of Frederick II.' be meant the Abbé Denina, we should as soon suppose it to be the production of some hoc-brained democrat, inspired from his grenier in Paris to blacken the character of the late Empress of Russia, to the honour and glory of sacred Jacobinism. Indeed, a much better work than this might have been compiled under the same title by some industrious bookmaker, from the materials already published, without the trouble of a journey to Petersburg, or even descending from his “ watch-tower in the skies.”
• We shall here sce (says this lofty writer) this great empress, so highly extolled by authors of the greatest celebrity, degrading herself to the vilest intrigues, becoming the miserable tool of her gallants, submitting to their most humiliating insults, and abandoning herself to the most infamous libertinism. We shall behold almost ali the sovereigns of Europe basely cringing at the feet of her contemptible favourites, granting them the most distinguished favours, de, corating them with those brilliant ribbons which they themselves took pride in wearing, and thus assimilating those heroes of the toilette with their boasted ancestors, with themselves, and with the noblest branches of their family. Lastly, we shall here see bloody wars undertaken, whole provinces overthrown, races of people torn from their country, thousands of men cut to pieces, or reduced to misery and despair, to satisfy the inordinate ambition of a base and worthless adventurer, repulsed in disgust from the bed of Catharine, forming a plot to dethrone her, and wretchedly dying at last, poisoned by the orders of his mistress.'
The introduction consists of a laboured comparison between the Emperors Claudius and Peter III. ; in which, if the two 13
portraits be not as like as they can stare, it is not from any ne. glect in the painter, who has made the resemblance as complete as he could.
Our countryman, Mr. Coxe, is very roughly treated by tliis panegyrist of Peter III. for having imputed weakness and debauchery to that unfortunate prince.-- However, he has occasionally dipped into respectable sources, though without naming tizem, for several of the historical facts which he relates. Speaking of the origin of Orlof, he says : .. His grandfather, an accomplice in a rebellion which threatened both the monarch and the state, was condemned to lose his head in 1698. The trunk of a tree served as a block on this occasion, but the whole length of it was already covered with the heads and the bodies of a row of Strelitzes, whom the tzar had decapitated with his own hand. Orlof's turn being come for laying his neck on the tree, and not finding room, he put airay with his hands the heads of his comrades, saying, Padile proch mné, miesta niet; “ Away with you, and make room for me." The tzar, on beholding this act of firmness, or of insensibility, suspended the axe, and gave him bis pardon. Such is the origin of the three brothers Orlof*, who afterward played such a conspicuous part in Russia,' &c.
This anecdote stands here unsupported by any authority: but, whether the writer knew it or not, it is probably derived from a book now extremely scarce, entitled “ Diarium itineris in Moscoviam D. de Guarient & Rall, ab imperatore Leopoldo I. od tzarum Petrum Alexiovitchium ablegati extraordinarii, descriptum à Joanne Georgio Korb, secretario ablegationis Cæsaria." Vienna, Austriæ ; in fol. This work contains the particulars of the tortures and punishments to which the rebellious Strelitzes were condemned, As, on this occasion, the justice of the tzar, was carried to the excess of cruelty, the court of Vienna, in tenderness to that monarch, caused all the copies of this hook, which were not immediately sold, to be suppressed. It is enriched with several copper-plates, at the sight of which the heart of the spectator sickens.- Whence our author ob. tained the following anecdote, it is not so easy to conjecture: When Peter III. had resolved to march against Denmark for the recovery of the territory of Holstein, he said to Marshal Rozumojski, hetman of the kozaks, “ I have made choice of you to accompany me, and shall give you the command of the army.”_" If tliat be the case, (returned the Marshal,) I shall take the liberty of giving your majesty a piece of advice.”— “ Well, what advice?"_" To form two armies instead of
The ancestor's name was Adler, a German, which word, eagk, is in Russ, Orel, Orlova, Orlof.
one." Why so ?". Because, on so difficult an enterprise, it will be necessary to have one behind that which I shall command, to drive it on.” The emperor laughed heartily as this reply, which he took as a joke of the marshal, who had never appeared at the head of a body of troops ; ' and yet,' continues our author, the observation was founded in truth. It is well known that the Russian soldiers are excellent troops ; machines of passive obedience, who move at the word of command, scarcely ever retreat, and suffer theinselves to be killed through fanaticism :--but their officers are in general the most dastardly in Europe. It is likewise well known, that, from one extremity to the other of this vast empire, containing a million -of square leagues in superficies, all who are not in a military dress tremble, fly, or sue for mercy at the sight of an uniform.' As to the bravery of the officers, the weapons of our warfare being of another kind, we shall leave the vindication of it to
the swords of Marshal Suvorof Rymnikski, and his countrymen in arms. One assertion, however, we shall venture to
contradict, concerning a transaction in which, as the author pretends to have been concerned, we might have reasonably expected a greater degree of accuracy."
An anonymous author, M. D. G. (he says) and M. de la Marche, drew up their account of the fall of Peter III. from the Manifestes Outrageans de Cathérine, and from the memorial which she published as the pretended justification of her. conduct, and of the murder of her husband.
• This memoir was composed by a Frenchman, named de Villiers, wlio went to Russia after having been struck off the list of advocates of Paris. General Betski, with whom I was intimately connected in friendship, proposed to me at the time to compose this apologetical memoir, and neglected no means for obtaining my consent : I refused his 'offers, saying to him, “ General, you are very friendly to me, and you have shewn me marks of your esteem: but my pen shall never be venal, and I have not the art of disguising the truth : neither pru. -dence nor my delicacy, will allow me to accept of this commission."
• On this refusal, application was made to M. de Villiers, who drew up the memoir from an outline sketched by the hand of the Empress ; I saw it at first, I read it afterward, and I can assert that this piece is the oraison funebre de la modestie de Cathérine.'
Now what will the reader think of the modesty of this writer, when he is told that the memoir in question is dated July 6, 1762 * ; and that M. de Villiers did not come to Russia rill af. ter the unfortunate death of Dr. John Brown, in 1766),
See Tooke's Life of Catharine II. vol. i. Appendix, p. 540. 3d edit. † See Biographia Britannica; artisle Brown (Dr. John).