Report on the Bacteriology of Water. 

 Bottle Screens, Coloured, &c. continued. 



333 



Number 



of clays 



incubated 



Results. 



No trace of letter. 



Q-ood X, but by no means all 



killed 

 No trace. Plate evenly covered 



all over 



Extremely faint " ghost " of Z 

 after twenty-four hours, and 

 invisible after forty- eight 

 hours. 



No trace. Germination all over 



No germination till second day. 



No letter 

 No germination till third day. 



Very faint and transient 



letter later 



Active germination and traces 

 of figures but transient only 



Letter T visible in twenty 



hours, but not all killed. 

 Letter X visible in seventeen 



hours, and sharpening up in 



twenty hours 

 Z visible, &c., pan passu with 



latter 

 Germination equal all over 



plate. No letter 

 Good letter H. 



Germinated evenly all over . . . 

 No letter appeared 



C out sharp, but diffused 



Faint N, cleared by 24th, but 

 bad outline 



Extremely ill-defined, and 

 never so good on H 



Germinated evenly all over. 



Much clearance over a shield- 

 shaped area in eighteen hours, 

 but no clear U 



Very sharp and clear T. 



Kemarks. 



The chlorophyll much oxidised and olive coloured 

 at end, but still cut out all the blue. 



f*Plane screen. The dilute fuchsin lets red 

 yellow and trace of green through, and then 

 blocks up to one-third between F and G. Then 

 lets a considerable proportion of blue-violet 



[ throuh. 



*Plane screen. This chromate is reciprocal to 

 dilute fuchsin. 



Same plate, screens, &c. Successive windows 

 opened. Bottle screen. Powerful inhibition 

 on the CS 2 side, and no germination there at 

 all at first. Faint " ghost " after twenty-five 

 hours on chromate side, but obliterated later. 



I Over same mirror. Both X and Z gradually oh- 

 i- literated next day i.e., spores not killed, only 



retarded. 

 J 

 Extremely good sun and blue sky. 



Exposed 1.45 to 4.15. Incubated at 25 C. 

 One screened ; the other not. Same plate, &c. 



| Same plate. H screened. N not. Very hot 

 brilliant sun and blue sky. Kept till 25th. 

 N clearest, but bad. 



Very hot sun, hazy first hour, then brilliant. 



2 A 2 



