APPENDIX. 455 



941. Cyanogen=C 2 N=Cy. An arbitrary symbol. 

 942. FeCy, 2KCy+HgCl 2 =FeCy,2KCl + Hg+2Cy. 

 943. Cyanide of Potassium==KC 2 N=KCy. 

 944. Prussian Blue = Ci 8 N 9 Fe7 = Fe 4 Cfy 3 . 



fFerrocyanogen=3Cy, Fe=Cfy. 

 945.j Ferrocyanide of Potassium = (3Cy, Fe+2K) = 



I Cfy,2K. 

 946. 2(3Cy, Fe + 2K) - K = (2(3Cy, Fe) + 3K) = 



2Cfy, 3K. 

 947. KCy+HO, SO 3 =KO, SOs+HCy. 



fTartaric Acid=CsH4Oi o, 2HO=T, 2HO. 



Oxalic Acid=C 2 O 3 , HO=O, HO.^ 

 .Citric Acid^CisHsOn, 3HO=Ci, 3HO. 

 49>1 Malic Acid=C 8 H40 8 , 2HO-M, 2HO. 



Formic Acid =C 2 HO 3, HO. 

 LLactic Acid=C 6 H 5 O5, HO. 



975. 



In the present state of our knowledge in respect to the 

 protein bodies, we must abandon every formula by which 

 their atomic constitution is said to be expressed. Generally, 

 they contain in 100 parts : 55.16 carbon, 7.05 hydrogen, 

 21.81 oxygen, 16.96 nitrogen, with to 1 per cent, sulphur 

 and phosphorus in an unknown form. 



Morphine^CssHaoNOe. 



C44H 2 3N 2 O8 or 



|Quinine=C 2 oHi 2 N0 2 . 



[Theine and Caffeine=Ci aHi oN 4 0. 

 993. Indigo=Ci6H 5 NO 2 . 

 994. Alizarine = C 2 o H i o O i o . 

 995. Hematoxyline C4oHi ?0i s. 

 1002. Vide 994. 



