434 Profs. Percy Frankland and Marshall Ward. 



40 



400 



360 



360 



340 



320 



L 



300 



80 



tC 



240 



2EO 



Temp. 



6p.m. 



200 



180 



160 



140 



ieo 



1*3' 



66// 



100 



/* 



ss//a 



80 



fcOt 



40 



20 



./. a! ill. 



y 



V 1 i 1 1 1 1 1 1 _-J 1 . i 1 1 1 1 



ZO 40 IO IQ 40 2-0 20 4O 5-0 2O 40 4O SO 40 5-0 EO 40 60 JO 40 



On December 11 spores in normal gelatine were put in at 22 at 

 1.45, and into measurement at 6.15 P.M. 

 The normal doubling period : 



20-2541 fj. = 6.45 P.M. 9.2 P.M. = 137 minutes at 14 '5 15 '1 C. 



It is a very long and tedious business to work out these slow 

 growths at low temperatures, but several other curves show that 

 about 200 minutes represents the doubling period for 14? C. ; the 

 time rises very quickly as the temperature falls, however, and I find 

 it is nearly 400 minutes for 10 12 C., and probably nearly 800 to 

 1000 minutes for 6 8. This is, no doubt, partly due to the stiffness 

 of the gelatine. 



