Notices respecting Ntw Books. S69 



covery of its qualities or properties ; and it is the assemblage 

 of these which is commonly called its nature : yet this is 

 very inaccurate, since these are only the consequences of 

 the essence. Hence we can give no definition of even the 

 simplest of things which comprehends its real essence." 



We have no hesitation in saying that this work cannot 

 fail to prove extremely useful. The first volume, in parti- 

 cular, is executed in a manner highly creditable to the judg- 

 ment and abilities of the author, who has rendered an essen- 

 tial service to his country by its publication. In praising 

 in- this particular manner the merits of the first, we would 

 not be understood as meaning to censure the second vo- 

 lume : from the very nature of its contents it was impossi- 

 ble to infuse into it the mind which pervades the other ; but 

 the author has collected in it much useful information, vthich 

 with less industrv and judgment than he possesses could not 

 have been brought together in the same compass. A future 

 edition would probably be rendered still more valuable, by 

 the suppression or alteration of a seemingly ex parte state- 

 ment of the comparative merits of Mr. Watt's steam-engine 

 and that of Mr. Hornblower ; which however is not given 

 in the work as the author's own production, but as from 

 Mr. Hornblower, or some relative of the same name. Should 

 the work meet with that reception which it merits from the 

 public, we have no doubt but a new edition will soon be 

 demanded. 



A Treatise on the Teeth of JFheels, Pinions, ^c, demon- 

 strating the lest Forms which can be given to them Jot 

 the various Purposes of Machinery, snch as Mill-ivork, 

 Clock-tvork, &c.', and the Art of fnding their Numbers. 

 Translated from the French of M. Camus j with Addi- 

 tions. Illustrated with fifteen Plates. Published by 

 J. Taylor, Holborn. 



This work is a translation of the tenth and eleventh, 

 books of M. Camus's Cours de Mathematique, The abi- 

 lities of tlie author are so well known to the learned world, 

 that nothing that can be said here can add to his fame; and 

 it i& but justice to the translator to say, he has executed his 



part 



