80 PARASITIC AMGEBJE OF MAN. 



were positive for Entamoeba coli upon July 10, and 

 two were still positive upon November 20. Neither 

 of these men had developed symptoms of diarrhoea 

 or dysentery during this time. 



As the result of our work we concluded that a 

 large proportion of healthy white men serving in the 

 Philippines harbored Entamoeba coli, which infection, 

 so far as we were able to observe, does not result in 

 diarrhoea or dysentery, some of the cases being ob- 

 served for 9 months without any symptoms develop- 

 ing. 



Summing up the observations of the writer in 

 San Francisco, in 1905, and those made in conjunc- 

 tion with Ashburn in Manila, we have the record of 

 307 examinations of as many healthy American 

 soldiers, of whom 176 or 58+ per cent, showed the 

 presence of Entamoeba coli in their feces. Some of 

 these cases have been followed for a period of three 

 years and in none of them have symptoms of dysen- 

 tery occurred. I have observed instances in which 

 Entamoeba coli has been constantly present in the 

 feces for periods of from 4 to 6 years, and not the 

 slightest symptoms of dysentery have developed. 



In attempting to disprove the existence of En- 

 tamosba coli Musgrave has instanced cases in which 

 amoeba? were found in the feces during apparent 

 health, but in which dysentery followed at periods 



