Report on the Bacteriology of Water. 



371 



The results of examinations at 2.57 P.M., 4 P.M., &c., are given in 

 the annexed table. They prove conclusively the evident light- 

 action. 





Curve 65, p. 372. 



If we take the doubling periods of the bichromate-culture, we have 

 (averages) 





1. 22 44, ft - 2.57 P.M. 4.8 P.M., i.e., 71 minutes at about 19 "7517 -75 C. 



2. 44 88 = 4.8 5.15 i.e., 67 17 '7518 -5 C. 

 8. 88 176 ,, = 5.15 ,,6.45 i.e., 90 18 '5 18'0'C. 

 4. 176352 = 6.45 8.19 i.e., 94 18 17 'O 3 C. 



