444 



Profs. Percy Frankland and Marshall Ward. 



The doubling periods here were as follows : 



31-5 63 fj. = 6.5 P.M. 6.40 P.M. = 35 minutes at 29 -027-2 C. 



63-0126 = 6.40 7.20 = 40 27 -227 '9 C. 



126-0 252 = 7.20 ,,8.11 =51 27 '9 27 '5 0. 



Or, reckoned back : 



319-5 159-75 /* = 7.42 P.M. 8.26 P.M. = 44 mins. at 27 -7527-5 C. 

 159-7579-8 ,, = 6.53 ,,7.42 =49 27 -25 27 -9 27' 75 C. 

 79-8 39'9 ,, = 6.16 6.53 =37 28"0 27'2 27'5 C. 



A scrutiny of these two tables does not bring out any increase 

 generally in the doubling period during the third to fifth hours of 

 exposure to these temperatures, as compared with the first hour ; but 

 the second table suggests that each doubling takes a slightly longer 

 time to effect. It may be that the temperature is not sufficiently far 

 from the optimum to show any great slowing effect in such short 

 periods. 



Next morning there was a very good crop in the hanging drop, left 

 at 26'5 27'5 all night, and this supports the above suggestions. 



On November 14 spores were sown as before at 11 A..M., and re- 

 mained at 22 C. till 4 P.M., then into box at 29 C. 



The first attempts to fix a filament failed, from floating. Mean- 

 while the temperature varied as follows : 



Temp. 



Time. C. 



4.1 P.M. = 28-25 

 4.15 = 29-5 

 4.32 = 29-1 



4-45 



= 28-75 



and at 5 P.M. I succeeded in fixing a filament, measured as follows : 



Curve 148, p. 442. 



