DR. PAVY AND DIABETES 47 



put our knowledge of the dynamics of enzymic action upon a 

 quantitative basis and have obtained information of the greatest 

 value for studies upon the living cell. In the case of inter- 

 actions which concern carbohydrates very important work has 

 been done, in this country especially, by Croft Hill and by H. E. 

 and E. F. Armstrong. We now know a great deal about the 

 course of such interactions when conditioned by enzymes and 

 such knowledge will make the experimental attack upon the 

 central problems of metabolism infinitely more profitable. 



The present moment is marked by a revival of interest in 

 biological matters on the part of those who have high chemical 

 qualifications and this is an auspicious circumstance. It must 

 not, of course, be forgotten that results obtained in the chemical 

 laboratory only become biologically valid when they have been 

 checked in the animal and that our problems require the organised 

 efforts of many workers with diverse qualifications. Because 

 of the difficulties inherent in the complex conditions presented 

 by our special material, the problems call continually for 

 courage and patience — the courage and patience which charac- 

 terised the subject of this memoir, F. W. Pavy. 



