No. 561] SHORTER ARTICLES AND DISCUSSION 575 



still moving in jar No. 1 ; 12 :11 p.m. "some movement in each jar 

 but only of T. obscuris"; 12:20 p.m. "There are still a few T. 

 obscuris moving in each jar, these have bubbles at their mouth"; 

 12:25 "Still a slight movement of a few but the 'suspended 

 animation' is practically complete"; 12:30 p.m. "No movement 

 in any." 



An analysis of the gas passing through the apparatus was 

 made at 3 p.m., December 19, and it was found to consist of 

 98.92 per cent, by volume of carbon dioxide (absorbed by KOH) 

 and 0.27 per cent, of oxygen (absorbed from the residual gas by 

 alkaline pyrogallol). Another analysis was made at 11 a.m., 

 December 20, showing 99.15 per cent, of carbon dioxide and 0.04 

 per cent, of oxygen. 



At the end of each experiment the last wash bottle of the chain 

 was detached from its mate, a rapid current of air was drawn 

 through it for several minutes, and then the larvae were shaken 

 out into a large open dish and allowed to remain fully exposed 

 to the air. Counts were made at intervals. The results of the ex- 

 periment are shown in the table below. 



Count made Dec. 21, 9 A.M. 



Summary 



The exposure of larva? of Tencbrio molitor and Tenebrio ob- 

 scuris to elevated temperature for a few hours causes a much 

 greater mortality among the larva? of T. molitor than among those 



■ Xone able to crawl as yet. The feet only are moving. 



