Report on the Bacteriology of Water. 



377 



Curve 71, p. 372. 

 Doubling periods : 



40 -5 81 -0 n = 2.45 P.M. 3.33 P.M. = 48 minutes at 26 C. 

 81 -0162 -0 = 3.33 4.27 =54 26 25 '5 C. 

 162-0 324-0,, = 4.27 5.13 =46 25 '5 24' 75 C. 



Reckoned back : 



594 -0297 -0 /* = 5.7 P.M. 6.14 P.M. = 67 minutes at 25-023-5 C. 

 297 -0148 -5 = 4.20 5.7 = 47 25 '525 '0 C. 



148 -5 76 -25 = 3.27 4.20,, =53 26 '0 25-5 C. 



On August G spores sown in two broth-drop cultures were kept 

 at 23 from 10.15 A.M. to 2 P.M., and germinated out well. 



Then placed over bichromate and water respectively during the 

 afternoon to test the light-action, with the following results (pp. 378, 

 379), a rodlet 6'75 /t long being fixed in the water culture, and one 

 13'5 ft, long in the bichromate culture. 



The morning had been very dull, but cleared up between 1 and 

 2 P.M. ; at 2.30 the sky was only just showing blue and hazy between 

 streaky clouds, little or no wind. From 2.37 to 3.10 the sky was 

 overcast with heavy dull clouds, but cleared a bit by 3.30, and from 

 3.50 to 4.45 again showed some hazy blue between streaky clouds. 

 The clouds get thicker, in fleecy streaks afterwards, and there was 

 some blue showing up to 4.50. Thence onwards was dull and over- 

 cast. 



The window was open south laboratory all the time, up to 6.55, 

 quartz, silver mirrors, card and matchbox screens, &c., as before. 



VOL. LVIII. 2 i) 



