Report on the Bacteriology of Water. 549 



Description of steam-sterilised water. ] Duration of life of -B. col! communis. 



Thames water (11.5.1893) kept at' 



6-8C. 

 Thames water (11.5.1893) kept at 



19 C. 



Loch Katrine water (4.7.1893) kept at 



&-8C. 

 Loch Katrine water (4.7.1893) kept at" 



19 C. 



( 



Still abundantly present, after consider- 

 able multiplication, on the 75th day. 



Between 14 and 17 days. The coli 

 bacilli were introduced in this case in 

 much smaller numbers than in that of 

 the Thames water above. No multi- 



plication was observed. 



Yery peaty water (30.10.1893) kept at ! Upwards of 24 days. Still present in 

 9 12 C. uncliminished numbers after very 



slight multiplication. 



12. The Bacillus coli communis introduced into unsterile water 

 persists in the living state for a much longer period than the typhoid 

 bacillus. Thus : 



; Duration of life of the -B, coli communis. 



Unsterile Thames water (11.5.1893)1 -,-, 1 ,. ir . -. , , , ,, 



. a oo rt Upwards of 40 days, and doubtless much 



K6Dt at D o O. If c.i 



TT -i mv. i 111 - iooo\ f\ longer, but no further examinations 



Unsterile Thames water (H.o.1893) ( 



kept at 19 C. j 



Unsterile Loch Katrine water (4.7.1893) "| 



kept at 68 C. 

 Unsterile Loch Katrine water (4.7.1893) 

 kept at 19 C. 



made. 



Upwards of 17 days. No further ex- 

 aminations made. 



13. In the numerous experiments made on the behaviour of the 

 typhoid bacillus and of the B. coli communis in water (Thames, Loch 

 Katrine, deep well, and peaty water) which had been sterilised by 

 filtration through cylinders of porous earthenware and baked in- 

 fusorial earth, a most remarkably rapid disappearance of both bacilli 

 was observed in all cases, excepting that of the Loch Katrine water. 

 Further experiments will have to be made before any definite con- 

 clusions can be drawn from these unexpected results. 



APPENDIX. 



The Behaviour in Potable Water of Anthrax Bacilli taken directly from 



the Animal Body. 



By PERCY FRANKLAND, Ph.D., B.Sc., F.R.S., and CHARLES TEMPLEMAX, 



M.D., B.Sc. 



In the 2nd Report to the Royal Society Water Research Committee, 

 " On the Vitality and Virulence of the Bacillus anthracis and its 

 Spores in Potable Water," the enquiry was mainly confined to the 

 deportment either of anthrax spores alone, or of such mixtures of 

 bacilli and spores which are found in the usual cultivations of anthrax 



