172 



METABOLIC HORMONES 



allatum in Calliphora, therefore, helps to maintain a high level of 

 metabolism, as shown by oxygen consumption ; and this is due to a 

 secretion from the gland, since a significant positive effect is 



50 

 45 

 40 

 35 

 30 

 25 

 20 

 15 

 ^ 10 



o 



§. 

 o 



^ 10 

 15 

 20 

 25 

 30 

 35 

 40 



45 



Operated controls, 

 femoles 



Females with three 

 implanted corpora 

 allata 



I 1 \ > 



J ! 1 L 



5 10 15 20 25 30 35 40 45 50 



Oxygen consumption mm^/lOOmg fly/10 min, 

 in class intervols 



Fig. 5-2. Diagram, similar to Fig. 5-1, to show the effect of 

 implanting three extra corpora allata into CalUphora. The mean 

 oxygen consumption for the flies with implanted corpora allata 

 (below) is increased as compared with that of the mock-operated 

 controls (above). (From Thomsen, 1949). 



produced when glands with no nervous connection are implanted 

 in the body cavity. Although it is now known that an active extract 

 of the corpora allata can be obtained with ether, it has not yet been 

 tested for its action on respiration (Hasegawa, 1957). 



