1913.] Studies on Enzyme Action. 339 



Table E. — Hydrolysis of Urea in M/5 Solutions in presence of Hydrogen 



Cyanide. 





Percentage of urea hydrolysed. 



j. inie 













(minutes). 





J.JU picacuLc ui 



All ' ' 







Alone. 



hydrogen 



hydrogen 



Alone. 



hydrogen 







cyanide M/25. 



cyanide M/5. 





cyanide, M. 



5 



8-8 



10 -9 



12 6 



9 7 



17 -0 



10 



15 -6 



18 -5 



21 9 



16-5 



31 -4 



15 



20 -4 



24 -0 





21 -3 



42 -2 



20 







36 -3 





53 -3 



30 



32 9 



38 -6 



49-6 



34 3 



69-1 



40 









_ 



81 -5 



45 



43 '4 



49 -8 



63-1 



44-9 





50 











89 7 



60 



52 -2 



59 -7 



75 -4 



53 -6 



94 -3 



75 



6L -4 



69-2 



86 -2 



63 -7 



98 "8 



90 



68-7 



77 -6 



94-8 



71 -5 





120 



83 -1 



91 6 



100 -o 



86 3 





Diagram 16. 

























a 



IU 







4 



















roly: 

























> 

 < 

























UJ 







C 



& 



yi 



lis 



















:entage of 



if 







































/ 



UJ / 

 0_ / 

























































TIM 



E IN ! 





rES 











20 40 60 80 100 120 



concentration and becomes very considerable in solutions of molecular 

 strength, 50 per cent, of the urea in such a solution being hydrolysed after an 



