354 Profs. Percy Frankland and Marshall Ward. 



Culture over Water-screen (+ trace of CuS0 4 ). 



This rodlet therefore grew 162'8 fi in three hours fifty-five minutes, 

 which at constant rate, would give O69 p. per minute i.e., 7'8 per 

 cent, of the original length. 



The filament doubled its length in the following periods : 



1. 8-817-6 p in 32 minutes at 2629 C. 

 2.17-635-2 ,,42 29 18-25 C. 



3. 35-270-4 52 18'25 19 C. 



4. 70-4141 58 1918-25 C. 



Culture over Screen of K. Bichromate. 



