Report on the Bacteriology of Water. 



405 





at 17 C. for some time, slowly falling during the afternoon to 16'75 

 by 4.30. On then opening to search the drop, the temperature rose 

 to 17'4 C., falling to 17 at 5 P.M., and 16'8 at 5.15. Germination 

 had begun at 5 P.M. The measurements began at 5.30 as follows, and 

 were carried through the night. 



Curve 84, p. 402. 



The doubling periods were as follows : 



1. 4 8 p. = 48 minutes at 16 '75 



2. 8 16 = 82 



3. 16 32 = 86 



4. 32 64 = 92 



5. 64128 = 86 



C. 



6. 128256 = 92 



16-75 16-5 C. 

 16 -5 16 -25 C. 

 16 -2516 -3 0. 

 16-3 16 16-25 C. 

 16-25 16-5 C. 



Calculated back : 



337 -5 168 -75 /u - 

 168-75 84-5 = 

 84-5 _ 42-25 = 

 42 -0 21 -0 = 

 21-0 10-5 = 

 10 -5 5 -25 = 



100 minutes. 

 86 

 90 

 94 



78 

 70 



Normal doubling periods : 



6 -75 13 -5 M = 6.0 P.M. 7.20 P.M. = 80 mins. at 16 '7516 -5 C. 

 13 -5 27 -0 = 7.20 8.40 = 80 16 -5 C. 

 27 -0 54 -0 = 8.40 10.17 = 97 16 -5 16 -2516 '3 C. 

 54-0 108-0,, = 10.17 11.42 =85 1G'3 16'0C. 

 108-0 216-0 = 11.42 1.13A.M. = 91 16 '0 16 -5 C. 





* Rose at once to 17'1 C. on opening side windows, falling again to 16'5 C. 

 in five minutes. 



t Up to 1675 C. on opening side window, down to 16'5 C. in five minutes. 



