16 ULTIMATE AND PROXIMATE ANIMAL PRINCIPLES. 



Urea, 



Cystic oxide, xanthic oxide, 



Uric acid, 



Erythric acid? 



Purpuric acid, 



Oxalic acid, 



Acetic acid, 



Lactic acid, 



Butyric acid, 



Formic acid, 



Benzoic acid, 



Sulpbo-cyanic acid, 



Sugar of milk, 



Sugar of diabetic urine, 5 



b Vegetable proximate principles are very numerous : 

 considered the chief: 



Not subject to variety ; 

 uniform in all in- 

 stances. 



the following may be 



- ' 



Sugar, 

 Starch, 

 Lignin, 



Gum, mucus, jelly, 



Extractive, colouring matters, bitter prin _ v. All subject to endless variety as 

 t .jp] es | occurring in different plants. 



Gluten 



Oils, fixed and volatile, 

 Resins, 



The following are constant in their character, or are peculiar to certain 

 vegetables. 



Various acids Oxalic, citric, tartaric, malic, moroxylic, gallic, laccic, kinic, 



boletic, prussic, meconic, benzoic, &c. 

 Various alkaline bodies Quinina, cinchonina, morphina. strychnina, brucina, 



delphina, picrotoxina, atropia, veratrina, hyoscyamina, &c. 

 Indigo, 

 Tan, 

 Suber, 

 Caoutchouc, 

 Wax, 

 Asparagine, ulmine, inuline, fungine, polychroite, haematine, nicotine, pol- 



lenine, emetine, sarcocol, olivile, medulline, lupuline, cathartine, 



piperine, daphnine, salicine, populine, digitaline, santonine, cafeine, 



hordeine, elatine, &c, &c. 



