Notices refpeBlng New Booh, ?9 



of fluids; on their equilibrium with folic! bodies immerfed in 

 them, with a table of the fpecific gravities of fome fluids and 

 folids ; on the utility of being acquainted with the fpecific 

 gravity of bodies; on the equilibrium of elaftic bodies, and 

 particularly the air; on pumps; on conveying water and le- 

 velling. — III. Hydraulics. The contents of this part are : on 

 the motion of water in general, when it flows from apertures 

 in the veflel which contains it; of the velocity of its efflux ; 

 on the quantity of water which iflues when the velocities are 

 equal ; on the quantity of the water which iflues through 

 lateral apertures when the velocity is not uniform ; on the 

 quantity of water which iflues from pipes ; on the motion of 

 water in dams and canals; on the different methods of de- 

 termining the velocity of running water; on the motion of 

 water in dreams; on the impinging force of water; on the 

 fall of water ; on the different method of applying float- boards 

 to wheels, and the aftion of the moving power of the 'water 

 thence depending; on the proper form of troughs for over- 

 (hot, half overfhot, and underfoot wheels ; on the proper 

 diameter of the wheels; on the greater!: poflible aclion of the 

 moving power of water on the different kinds of wheels ; on 

 the action of the compound moving force of water, and on 

 the efle& of the moving power of water on horizontal wheels. 

 - — This work (hows that the author is not a mere theorift, and 

 that he has united the principles of found theory with very 

 extenfive practice. 



Hifloire des Matbematiques, dans laquelle on rend Compte de 

 leur Progres depuis four Origuie jufqu'a nos Jours, &c. 

 A Hiflory of the Mathematics, containing an Account of 

 their Progrefs from their Origin to the prefent Time; in 

 which a View is given of the principal Difcoveries in every 

 Branch of the Mathematical Sciences, of the Difputes 

 which have arifen among the Mathematicians, and of the 

 principal Circumflances in the Lives of the moft celebrated. 

 A new Edition, confiderably augmented, and continued to 

 the prefent Period. By J. E. Montucla, of the National 

 Inftitute. Vols. iii. and iv. 4to. completed and publifhed 

 by Jerome Delalande, of the National Inftitute, with 

 nineteen Plates, and the Portraits of Montucla and De- 

 lalande. 



MONTUCLA, above thirty years ago, publifhed the two 

 firft volumes, of this work, which contain the hiflory of the 

 mathematics to the end of the fevewteenth century. This 

 part was incomplete; and the author made conflderable ad- 

 ditions 



