230 



Geological Society :- 



Name of substance. 



Symbol. 



Absolute 

 weight in 

 grammes. 



Relative 



weight. 



Hydrogen 



Oxygen 



Water 



Chlorine 



Hydrochloric acid 

 Oxide of chlorine 

 Hypochlorous acid 

 Ter oxide of chlorine. 

 Chlorous acid ... 

 Chloric acid 



Nitrogen 



Ammonia 



Protoxide of nitrogen 

 Nitrite of ammonium .*. 

 Chloride of ammonium . . . 



Phosphorus 



Phosphide of hydrogen . . . 

 Pentachloride of phosphorus 

 Terchloride of phosphorus 

 Oxychloride of phosphorus 



Carbon 



Acetylene 



Marsh-gas 



Alcohol 



Ether _ ... 



Acetic anhydride 

 Acetic acid 

 Trichloracetic acid 

 Hydrocyanic acid 

 Cyanogen 



e 



al 



«X 2 . 



*x n 



«x 2 S 

 «x£ 3 

 «x 2 S 

 «x£ 2 

 «x£ 3 



av 2 

 a 2 v 



av 2 l 



a 3 v X 



a 2 4 



a 2 <p 



a 3 X 5 



« 2 9X 



a 2 <px 3 Z 



kV 



«K 2 



a 2 K 



a 5 K 4 | 



a 3 /c^ 3 

 a 2 K 2 e 

 a 2 X 3 ic 2 Z 2 

 avK 



0-089 



1-430 



0-804 



3-173 



1-631 



3-888 



2-346 



5-319 



3-062 



3-777 



1-251 



0-760 



1-966 



2-860 



2-391 



5-541 



1-519 



9-319 



6-145 



6-869 



0-536+^ 



1-161 



0-704 



2-056 



3-308 



4-559 



2-682 



6-146 



1-207 



2-324 



1 

 16 



9 



35-5 

 18-25 

 43-5 

 26-25 

 59-5 

 34-25 

 42-25 

 14 



8-5 

 22 

 32 



26-75 

 62 

 17 



104-25 

 68-75 

 76-75 



13 



8 

 23 

 37 

 51 

 30 



68-75 

 13-5 

 26 



Section VIII. Certain apparent exceptions are considered, in which 

 it is not found possible to express the symbols of chemical sub- 

 stances by means of an integral number of prime factors, consist- 

 ently with the assumption of the modulus a. 



GEOLOGICAL SOCIETY. 

 [Continued from p. 155.] 



Jane 20, 1866.— Warington W. Smyth, Esq., M.A., F.R.S., 



President, in the Chair. 



The following communications were read : — 



1. "On the Structure of the Red Crag." By S. V. Wood, Esq., 

 F.G.S. 



The Rev. O. Fisher having lately published a paper in which he 



