EXTENDED TO DENSE BODIES. 593 



A Few Common Salts. 



Table Salt (g^ ^ ^ST^S x 1 2 ^^.^^ ^-IS. Kopp. 



AQ 324 ^ ^^ 



with full atomic weights, it comes out 2-22. Expt. 2*22. 



Sulphate of Soda (^^k.^^^Igj^^ ^2-62. Expt. 2-63. 



Glauber's Salt is a fine molecule, the body composed of (aqHO)^^, the poles 

 SOgNaO ; formed into a dodecatom occupying 8 volumes, G=l-49. Expt. 1-47. 



Sulphate of Potass <>= ( ^-^^^» = ^^^° = 2-67. E.pt. 2-66. 



r ( NO,KO),, _ 



XT-. r- ) 2AQ -' '• 



Witre ... ^- ^ Mean 2-08 Expt. 2-07. 



V with poles marked = 2- 18 



^ (N0,H0,NH3),, 

 \ 2AQ — J- iu 



Nitrura Flammans . G = ^ j^^^^ j.g2 j,^^^ j.^ 



(^ with poles marked 1'75. 

 Sal ammoniac . G= | ^ 4AQ ' Expt. 1-5. 



Ammonia, in our theory, in one of its forms is isomorphous with aqaq, or 

 double vapour, and affects the molecule am^g, like aqg^. 



A Few Common Minerals. 

 As the attempt to show the structure of highly compounded molecules in 

 common writing is necessarily difficult, let us here take the shortest symbols 

 possible for the common mineral constituents, as for instance, S for SiO^, A for 

 AI2O3, F and F for FeO and Fefi^, and H for HO. 



Quartz G=: ^-i^^ = ^-^^ = 2-59. Expt. 2-5 ... 28. 



The dodecatom with K instead of "S, gives G = 3-82. Expt. 8-87. 

 But as developed by nature, it may be, — 



Sapphire q A^12) + 'm^£)i2'^ =3-82 + 4-44 Mean = 4-12. Expt. 4-08. 



j But the same specific gravities are obtained by the finer molecule of the form 



' X X X 



~2A0^"' "^^^ ^^^^ molecules we are not to regard as too large, as is clearly 



VOL. XXIII. PART III. 7 X 



