360 Profs. Percy Frankland and Marshall Ward. 



Lengths. 



A. B. Temp. 



Time. p. /u. C. 



4.0 P.M 36-0 36-0 2-2-0 



4.10 42-75 43-83 22'0 



4.32 ., 54-0 54-5 22-0 



5.5 76-5 77-0 22-0 



5.35 99-0 100-0 21-75 



5.55 119-25 121-5 21-75 



6.5 130-5 135-0 21%5 



6.30 157-5 166-5 21-5 



6.45 182-25 19575 21'0 



7.0 204-75 222-75 210 



It must be allowed, from the results, that the measurements attain 

 a high degree of accuracy, but they suggest, at the same time, that 

 the problem of detecting the exact effect of slight differences of 

 illumination is extremely difficult for direct solution in this way. 



After standing all night at 20 C., these two nearly equal cultures 

 were exposed from 9 A.M. to 8 P.M. to a very blue sky, with passing 

 white clouds, on July 4th, A over water, B over bichromate screen 

 quartz, silver mirror, shades, &c., as before to see if spore-formation 

 would be affected differently by the different lights. At 8 P.M., 

 July 4, the final segmentations prior to spore-formation were visibly 

 commencing in B, but neither showed spores as yet. 



The following are the temperatures for the day, July 4 : 



Temperatures. 



1. "B. 



Time. C. C. 



9.0 A.M 17-5 17-5 



10.0 18-5 18-5 



11.0 20-25 20-0 



11.45 22-0 22-0 



12.30 P.M 24-5 24-5 



From 12.30 to 2.30 they were brought into the north laboratory, to 

 avoid further rise of temperature ; the temperature remained at 23. 

 At 2.30 they were returned to the south window. 



C. C. 



2.30 P.M 23-5 23-5 



3.0 22-0 22-0 



7.0 ., 21-0 21-0 



8.0 21-0 21-0 



Owing to partial drying up, I had to abandon the cultures, but it 

 was clear that B was far in advance of A in respect of spore-forma- 



