274 



G. M. FRANK AND A. D. SNEZHKO 



The following form of the experiment, however, seems to demonstrate 

 still more convincingly the local and direct character of the response 

 produced by radiation. The brain was irradiated through an aperture 



Fig. 2. — Change At in the result of abdomen irradiation. 

 1, before irradiation; 2, 2 hr after irradiation; 3, 3 hr after irradiation. 



in the lead screen as small as 4 mm^, the entire body and the remaining 

 part of the head being screened. At the site of the treatment two elec- 

 trodes were inserted, one of them into the cortex, the other into the 



AI (% 



AI (%) 



I 2 3 4 5 6 



Time (hr) after irradiation 



I 2 3 4 5 6 



Time (hr) after irradiation 



Fig. 3. — Dynamics of the change At in the irradiated and unirradiated area of the brain. 



(a) subcortex; (b) cortex. The vakie At is a percentage of the norm taken as 100. 



1, irradiated area; 2, unirradiated area. 



subcortex. x\nother pair of electrodes was arranged at a distance of 

 5 to 8 mm from the small irradiated area of tissue. When recording the 

 "oxygen test" only in this small irradiated area an increase of the 



