EXPERIMENTS ON GUINEA PIGS. 



19 



ments. This disappearance of caffein from the stomach and intestines 

 may be due to bacterial decomposition or to reabsorption. But since 

 caffein is known to resist putrefactive changes, absorption from the 

 gastrointestinal tract and decomposition in the tissues must be 

 assumed, which may account for the smaller percentage amounts of 

 caffein found at the end of forty-eight hours. 



SERIES X. Guinea pigs, 100 mg per kilo of caffein injected, 24-hour period. 



SERIES XI. Guinea pigs, 100 mg per kilo of caffein injected, 48-hour period. 



