478 J. M. HAMILL. 



tubes ; further, new and stronger frog's enterokinase used in experiment 

 C activates cat's pancreatic juice just as readily as does the enterokinase 

 of the other animals. 



We are justified, therefore, in concluding from the above experiments 

 that both enterokinase and trypsiiiogen are not specific for each animal 

 but are always the same definite chemical individuals although occurring 

 in widely different classes of animals. 



REFERENCES. 



(1) Bayliss and Starling. This Journal, xxix. p. 174. 1903. 



(2) Delezenne. C. R. Soc. Biol. p. 1164. 1901. 



Towards the expenses of this research a grant was made by the Scientific Grants 

 Committee of the British Medical Association. 



