Report on the Bacteriology of Water. 



tion. I fear that a new difficulty arises here that of ensuring that 

 each calture-drop shall contain the same amount of food-materials, if 

 it is to last a long time ; of course one does one's best to have the 

 drops of equal size, and the drying up was here due to the different 

 water contents of the cotton-wool in the arms of the cells. 



In the following case the experiment was made in the north labora- 

 tory, fully exposed to the overcast sky, the day hot and nultry. The 

 spores were sown in weak gelatine, as before, at 9 A.M., and were in 

 the dark at 22 C, till 2 P.M. Germination was established at 2.30 

 and at 4.15 ; the measurements were begun on two filaments almost 

 exactly the same length. The results testify strongly to the accuracy 

 of the measurements and the equality of growth under like con- 

 ditions (Curves 57 and 58). 



Lengths. 



\ 



Temp. 

 C. 

 24-5 

 24-5 

 24-5 

 24-5 

 24-25 

 24-25 

 24 

 24 



23-75 

 235 



VOL. L71I1. 



2 C 



