180 RELATION OF CAFFEINE, ASPARAGINE, 



of water, can yield taurine, the nitrogenised com- 

 pound peculiar to bile : 



1 at. caffeine or theine = C 8 N 2 H 5 O 2 

 9 at. water ............ = H 9 O 9 



9 at. oxygen ............ = O 9 



= 2 at. taurine..... ....... = 2 (C 4 NH 7 O 10 ) 



A similar relation exists in the case of the pecu- 

 liar principle of asparagus and of althaea, asparagine; 

 which also, by the addition of oxygen and the 

 elements of water, yields the elements of taurine : 



1 at. asparagine = C 8 N 2 H 8 O 6 

 6 at. water ...... = H 6 O 6 



8 at. oxygen ... = O 8 



= 2 at. taurine = 2 (C 4 NH 7 Oi ) 



The addition of the elements of water and of a 

 certain quantity of oxygen to the elements of theo- 

 bromine, the characteristic principle of the cacao 

 bean (theobroma cacao), yields the elements of 

 taurine and urea, of taurine, carbonic acid, and 

 ammonia, or of taurine and uric acid : 



1 at. theobromine Ci 8 N 6 H, O 4 ^ r 

 22 at. water .. 



16 at. oxygen ... O 



22 f ~] 1 at. urea... C 2 N 2 H 4 O,, 

 u J 



or 



1 at. theobromine C J8 N 6 H 10 O 4 "j |"4 at. taurine C 16 N 4 

 24 at. water ...... H 24 O 24 > = < 2 at. carb . acid C 2 O 4 



16 at. oxygen ...... O 16 J 12 at. ammonia N 2 H 6 



C 18 N 6 H 34 44 



