Atomic Volume a fid Specific Gravity. 



471 



74-55 



1-660 



I. MgO, SO3 + 7HO, vol. of salt 



II 



Ill 



IV. ... 



Mean . . 



Sulphate of Zinc, ZnO, SO3 + 7HO = 143-43. — This 

 salt possesses the same property as sulphate of magnesia, of 

 causing a contraction when the anhydrous salt is dissolved in 

 a large quantity of cold water. — 



35-9 grains were dissolved in ^l4'6 grains of watei* fl*'-a^^'' 

 temperature of 32°, causing a rise in the stem of 14-03. At 

 90° the rise was 15-77. 



ZnO, SO3 + 7HO, vol. in solution 63. 



The half of an equivalent of this salt, 71*71 grains, being 

 thrown into a saturated solution, caused an increase of 37-J ; 

 and 35'85 grains produced a rise in the stem of 18*6 in two 

 experiments, and of 18*5 in a fourth. 



ai 



I. ZnO, SO3 + 7HO, vol. of salt 



II 



Ill 



IV 



Mean . . 



74-2 

 74-4 

 74-4 

 74-0 

 74-25 



Sp. gr. 



1-933 



1-928 



1-928 ! 



1-937 

 . 1-931 

 -The fourth 



Sulphate of Iron, FeO, SO3 + 7HO = 1383. 

 part of an equivalent, 34-6 grains, dissolved in 3140 grains of 

 water at 32° with an increase of 15*25, which became 15*75 



at SO'- 



63. 



FeO, SOg + 7HO, vol. in solution 



The same quantity of salt thrown into turpentine gave in 

 one experiment an increase of 18-6, in another of 18-7, and 

 in a third of 18*6. 



Sulphate of NickeU NiO, SOg + 6HO = 131-74.— This 

 salt we found to contain only 6 atoms of water instead of 7 

 atoms, as usually described; but it is known to crystallize 

 with both proportions. On dissolving 35 grains in 1000 of 

 water, the increase obtained was 14-0 at a temperature of 55°. 



NiO, SO3 + 6HO = vol. in solution 52-7. 

 We have not ourselves obtained the specific gravity of this 



