16 



Profs. Percy Frankland and Marshall Ward. 



Remarks. 



The plates li- 

 quefied so ra- 

 pidly, it was 

 impossible to 

 count the num- 

 erous colonies 

 accurately. 



Many liquefy- 

 ing. 



Calculated 

 total number 

 of bacteria 

 per 1 c.c. 



V „ J f H ^ 



co *o cm os *o © cm © co 



OS l-» CO t— 1 „ ^ o CO iO 00 

 CO OS X J> CM1O00CN© 



r-t iH 



Actual 

 number 

 of colonies 

 on plate. 



O 



o 



CM 



OS OS 00 "2 cv 1> © OS © © 



cm eooos «v- © co © os 



i-H O i— 1 0? CO 



Number of 



drops 

 per 1 c.c. 



-f ICS Tft CM \C5 CM © kO *C lO 

 CM CM CM CM CM CM CO CO CM CM CM 



Number of 

 drops used 

 for plate. 



iH iHCOCO CO OS i-l CO CM OS 



Tempera- 

 ture, 

 degrees C. 



cm \a 



O <M 

 CM »H 



Number of 

 days in- 

 cubated. 



CO COCOCO "'f "'t 1 CO CC 04 £ s 



Condition of 

 water. 



Fresh from river 

 and untreated. 



>> 

 >> 



Date of 

 making 

 plate. 



CM CM tM 

 OS CM OS 



co" z z z - ^ coscm'ss 

 A © -! 



(M CM O 



rH 



Dates on 

 which water 

 was col- 

 lected. 



CM CM CM 

 OS OS OS 



co r ^ r r~ cosoq^P 



o r! 



n oq o 



H 



