of oxygen consumption continues (per individnum and per gram/hour); only 

 in 6 specimens (35 p. c.) an increase can be seen, more significant in merely 

 2 specimens. The implantation of c. allata into castrated females is manifested 

 usually by a weak, but distinct consumption decrease: on the 1st day approxi- 

 mately 14-3 p. c, on the 2nd day 31-6 p. c, 3rd day 30-4 p. с of the total 

 oxygen consumption increase compared with castrated specimens, and on the 

 1st and 2nd day about 25 p. с of increase as compared with controls. 



The rise of oxygen consumption by about 25 p. с after the implantation 

 of с allata into individuals wdth their own с allata inactive as compared with 

 controls shows that it is analogic to the decrease observed by Thomsen after 

 allatectomy in the flies Calliphora erythrocej^hala. 



In castrated individuals (with с allatum implanted) we may observe on the 

 first day a relative consumption increase by 22 p. с with a simultaneous 

 absolute consumption fall as compared with controls; on the second day, 

 however, the consumption of the experimental groups begins to diminish (by 

 17 p. с compared to controls) so that in average the rise is very small (2-5 p. c). 



The results of our experiments with castrated et non-castrated females 

 show that the JH effect is in correlation with the development of Ovaria; 

 the JH influence on the total metabolism reported by various authors seems 

 to be only an indirect consequence of the enlarged volume of metabolically 

 active tissues with diminishion of the metabolically inactive reserve materials. 

 Even if in further experiments a slight rise of oxygen consumption were confirmed 

 in castrated individuals as well, it would not be controversial to our conclusion 

 because in the adult female of P. apterus other tissues might exist beside the 

 ovarial folicles the function and growth of which are dependent on JH (e. g. 

 female accessory glands). 



Owing to the results it can be concluded that the JH effect does not consist 

 in a support of the total metabolism, as it has been supposed by a greater 

 part of authors, but in a catalytic activating effect on proteosynthesis. This 

 conclusion is in full accordance with the conception — continually confirmed 

 by new investigations — of a distant homology between с allatum in insects 

 as source of JH and the anterior hypophysal lap as source of the somatothropic 

 hormone (cf. Hanström, 1939, 1952, В. u. E. Scharrer 1944, В. Scharrer 

 а. о.) Of course it is necessary to confront our results nearer with those obtained 

 recently from other insect species which seem to speak for the direct influence. 



РЕЗЮМЕ 



Предварительные опыты, которые являются составной частью более систематичес- 

 ких исследований механизма действия ювенильного гормона (ЮГ), были направлены 

 на изучение действия ЮГ на имаго клопа Pyrrhocoris a-pterus (L.) Было исследовано 



150 



