to the size of their Molecules, 4*c. 



298 



Such is a very brief view of the First Memoir of M. Avo- 

 gadro, which was read on the 7th March 1824, and is pub- 

 lished in the thirtietli vol. of the Memorie delta Reale Accademia 

 delleScienze de Torino. In the thirty-first vol. of the same work, 

 our author has published a second Memoir, the object of which 

 is to give for all bodies a general formula, expressing the rela- 

 tion between the density, the mass of the molecule, and the af- 

 finity for caloric, of which the above formula is only an ap- 

 proximation, and which might even apply itself in all its gene- 

 rality to bodies which appear commonly under a solid form, if 

 we had for them all the data which that application requires. 



This Memoir is divided into two sections ; in the first of 

 which our author establishes a formula for the densities of li- 

 quids, in relation to a particular state in their law of dilatation ; 

 while, in the second, he transforms this formula, in order to 

 compare it with that for solid bodies, and to point out the con- 

 nection between the two. 



M. Avogadro considers, that the dilatation of liquids may 

 be represented by two terms, the one proportional to the in- 



