Atomic Volume and Specif Gravity. 4S8 



Sp. gr. 



ZnO, SO3 + KO, SO3, vol. ofsalt 59-6 ... 2-816 



Sulphate of Magnesia and Potash, MgO, SO3 + KO, SO3 



= 14<8*29. — 37'07 grains, or the fourth of an equivalent, 



caused in one experiment an increase of 13*9, and in a second 



of 13'8, the temperature being 56'^. iij-^q-i a inu, 



-do JVIgO, S03+KO,S03,vol.ofsalt 55-G ... 2-667 ■ (.155 

 ' .,.«,.. ... ... 55;2 ... 2-686 .nu\ 



Mean . . 55'^ ..^ 2-676 h\m 



Sulphate of Manganese and Potash, MnO, SO3-I-KO, SO3 

 = 163-07. — 40-8 grains of this salt, one-fourth of an equiva- 

 lent, placed in turpentine, caused an increase of 13"5 in one 

 experiment and 13-6 in another, at a temperature o^ 55'^. '. 



"■ '' ' MnO, SO3 + KO, SO3, vol. of salt 54-0 ... 3^olo '^^^ 



■iBnic.:!- - ^ - .2:996,;"' 



•.ft £C' Mean . . 54-2 ... 3-008 rr-r 



Sulphate of Copper and Ammonia, CuO, SO3+ NH4O, SO3 

 = 145-88. — 36-53 grains of this salt thrown into turpentine, 

 caused an increase of 16'7 in one experiment and 166 in an- 

 other, at a temperature of 60°. '^^^ 



Sp. gr. /idj 



I. Sulphate of copper and ammonia 66'6 ... 2*190:HT 



II. ... ... ... 66;2 ... 2-204 jdi 



08 ^O/i ^->oA> t^^ Mean . . 66*4 ...2-197''^ 



Sulphate of Zinc and Ammonia, ZnO, SO3 + NH^O, SO3 

 = 1 46-0. — 30 grains of this salt thrown into turpendiie* 9au^e<| 

 an increase of 13-5 at 60°. '^ "' f ' ^ o?" 



Sp.'gr. 

 Sulphate of zinc and ammonia, vol. of salt 65*7 ... 2-222 

 Sulphate of Magnesia and Ammojiia, MgO, SO3 + NH4O, 

 SO3 = 127-12. — The fourth of an equivalent (31*78 grains) 

 placed in turpentine, caused an increase of 16*5 in the first 

 experiment, and of 16-4 in the second. 



I. Sulphate of magnesia and ammonia 66-0 ... 1"926 

 II ... ... ... Q5-6 ... 1-938 



Mean . . 65-8 ... 1-932 



Sulphate of Alumina, Al2033S03=17r95. — This salt, and 

 the anhydrous alums, offer difficulties to the correct estima- 

 tion of their specific gravity on account of their great porosity 

 and liability to carry down air. Tlie best mode of obviating 

 this source of error is to introduce a metallic wire previously 



