Atomic Volume and Specific Gravity, 489 



I. NaOjNOsVol. ofsalt 39-2 ... 2-18oT, . 



ILj , ,... ... 39-2 ... 2-180 



'rtir '"'... ... 39-2 ... 2-180 



''?i '^^^'^f^ •" -^ _^ 39^ ^ 2-190 



Mean . . 39-1 2-182 



Nitrate of Silver, AgO, NO5 = 170-0. — On dissolving 42-5 

 grains of this salt in 1000 grains of water, an increase of 6-8 

 was effected at a temperature of 59°. 



AgO, NO5, vol. in solution 27-2. 

 The same quantity of salt, 4*25 grains, thrown into turpen- 

 tine, produced an increase of 9-8. j { 



AgO, N05 vol. of salt 39-2 ... 4-336 

 Nitrate of Lead, PbO, NOg^ 165 '75 .—This salt gives very 

 unsatisfactory results on being dissolved in water; at low 

 temperatures the volume for the atom is equal to nearly 18*0, 

 or 9 X 2. But at higher temperatures the volume in solution 

 approaches nearly to 27*0, or 9 x 3 ; and, although the re- 

 sults do not come out exact, unless corrected for expansion, 

 we are inclined to view the latter as the true result. 83 grs. 

 dissolved in water gave an increase of 12-5 ; in a second ex- 

 periment of 12*7, both at a temperature of Go°. 



PbO, NO5, vol. in solution 25-0 



25-4 

 Mean . . 25-2 m>^ 



The fourth part of an equivalent, 41-43 grains, immersed in 

 turpentine, gave an increase of 9*7 ; 82-87 grains gave the in- 

 crease 19-2 ; and in a third experiment 19-0. * ' '. , 



I. PbO, NO5, vol. of salt 38-8 ... 4-272 



II. ... ... 38-4 ... 4-316 



III. ... ... 38-0 ... 4-362 



Mean . . 38-4 ... 4-316 



Nitrate of Barytes, BaO, NO5=130-85.— Half an equiva- 

 lent of this salt, 65-42 grains, dissolved in 1000 grains of 

 water with an increase of 13-5 at a temperature of 60°; and 

 a repetition of the experiment was attended with the same 

 result. 



BaO, NO5, vol. in solution 27-O. 



The same quantity of salt, immersed in turpentine, caused 

 an increase of 19-8 in three experiments, and 20-0 and 20-2 

 in two other experiments; the salts being all different speci- 

 mens, and decrepitated previously to the experiment. 



Phil. Mag. S. 3. No. 183. Suppl. Vol. 27. 2 K 



