J|8 R. H. A. PLIMMER AND J. L. ROSEDALE 



present in the pancreas of animals. The proteoclastic enzymes show a differ- 

 ence: the animal has trypsin acting in alkaline media; the chicken in both 

 alkaline and acid media. The intestine of the chicken has an enzyme acting most 

 rapidly in acid medium, less rapidly in alkali. The proteoclastic enzyme of 

 the proventriculus acts only in acid medium; the organ corresponds to the 

 stomach of animals. The caeca, as expected, had no enzyme of this group, 

 but contained diastase. 



We wish to thank Prof. J. A. MacWilliam, F.R.S., for kindly allowing us 

 to carry out these experiments in his laboratory. 



REFERENCES. 



Plimmer (1906). J. Physid. 34, 93; 35, 20. 

 Plimmer and Rosedale (1921). J. Agric. Sci 



