67 



Houston artificially infected Thames River water with pure cultures 

 of Bact. typhi and noted the proportion of survivors are infleuced by the 

 temperature of storage. The results, based on ten experiments at each 

 temperature, are summarized below: 



TABLE XXXI. EFFECT OF TEMPERATURE ON VIABILITY OF BACT. TYPHI 



IN THAMES RIVER. 

 (After Houston 1913) 



'Initial number 103,328 per c. c. 



/CO ZOO 



7~/me E/apsed /n 



