493 



mjcelium (on feeding- with glucose us source of carbon and NH^NOj 

 as source of nitrogen), and that in addition, destruction of this 

 enzyme takes place, wiiich at first becomes negligible in compa- 

 rison witii the formation, l>ut which soon makes itself so evident 

 that the total quantity quickly decreases, after it has reached a 

 maximum about 5 days from the commencement of gei-mination. 

 Into the nntriejit fluid there passes never more than a very small 

 part of the total quantity of enzyme, occurring in the mycelium ; 

 this is perhaps pai'tlj derived from dead cells. 



Utrecht, August 1918. 



