Report on the Bacteriology of Water. 



441 



On November 12 spores were sown as before at 10.30, kept at 

 22 C. till 3.30, when into Sachs' box at 24'5 C. 

 Doubling : 



20-2540-5 n = 3.30 P.M. 4.10 P.M. - 40 minutes at 23-025-0 C. 



Back : 



47-2523 -5 /t = 3.37 P.M. 4.22 P.M. - 45 minutes at 24 '7525 '0 C. 



Another culture, exactly as before at 22 since 10.30, was put in at 

 4.30. 



Curve 142, p. 442. 



I had now to stop, the filament was too long to measure further. 

 The doubling periods here : 



78-75157 -5 /* = 4.39 P.M. 5.17 P.M. = 38 minutes at 24-2524 '75 C. 

 157 -5 315 -0 = 6.17 ,,5.68 =41 24 '75 25 '2 C. 



Reckoned back : 



423-0211-5 n = 5.34 P.M.- 6.17 P.M. = 43 minutes at 25 -025 -5 C. 

 211 -5 105 -25 = 4.55 5.34 =39 24-6 25-0C. 



Normal doubling periods 



115230 ft. = 5.0 P.M. 5.40P.M. = 40 minutes at 24 -6 25 '0 C. 

 230460 = 5.40 



not completed, but at present rate not far from 6.24 P.M., which = 44 

 minutes. 



On November 13 a sowing, as before, made at 2 P.M., was put in at 

 9 P.M., and measured as follows : 



Doubling period : 



58 -5117 -0 n = 9.3 P.M. 9.50 P.M. = 47 minutes at 24 -525 7524 '9 C. 

 VOL. LVHI. 2 H 



