BY DR, 0. KATZ. 



263 



In looking over this table one notices at once a rather great 

 difference between the individual results obtained. In the great 

 majority of cases thei'e was only a limited number of germs in 

 Iccm. and |^ccm. respectively; in some there were none at all; 

 while in two the colonies amounted to some hundred, and in one 

 case to the enormous number of 17,000-18,000 per ccm. From 

 the given figures we may well conclude that the quantity of 

 bacterial germs in the ice from the above company kept in general 

 within reasonable limits, and that in those few cases where several 

 hundred or several thousand colonies made their appearance, I 

 must have hit upon spots where the water before freezing was much 

 contaminated, some how or other. We shall have to come back 

 once more to this ice. 



"CITY ICE COMPANY." 



^ 2 0) 

 o 



Day when 



colonies wave 



counted. 



.s 



Temperature of incubation. 



Colonies 



either 



counted 



throughout 



or calculated. 



Nun 



col 



in 

 1 ccm. 



iber of 

 onies 



in 

 i com. 



1888. 



1888. 













Jan. 17 



Jan. 19 



54 



75-79^F. = 238-26;°C. 



Calculated 



2288 

 2269 



1370 

 1248 



„ 19 



„ 22 



67 



75-78°F.-23«-25rC. 



Counted... 



77 

 84 



39 



47 



,, 21 



„ 24 



67 



74-76°F. = 23i-24fC. 



Counted . . . 



85 

 112 



28 

 47 



„ 24 



„ 27 



66 



72-5-76°F. = 22i-24f C. 



Calculated 



314a 



3389 



1680 



1490 



„ 26 



„ 28 



48 



74-77°F. = 23J-25°C. 



Counted . . . 



674 

 772 



300 

 liqueQed 



„ 28 



„ 30 



42 



72-5-76-5°F. = 22i-24}fC. 



Counted . . . 



658 

 501 



.301 

 261 



„ 31 



Feb. 2 



54 



73-5-78°F. = 23iV25rC. 



Counted... 



123 



130 



7:i 

 50 



Feb. 2 



„ 5 



66 



74-78°F. = 23.1-25^0. 



Counted . . . 



911 



nil 



481 

 39H 



„ 4 



„ 7 



70 



73-5-77°F. = 23,V25°C. 



Counted ... 









 



}, 7 



„ 10 



70 



73-77°F. = 22J-25T. 



Counted . . . 



67 

 73 



28 

 33 



„ 9 



„ 12 



70 



72-5 76°F. = 22i-24^8°C. 



Counted . . . 



20? 

 270 



137 

 153 



„ 11 



„ u 



62 



74-75°F.=23.V23r;0. 



Counted . . . 



•i 







1 







