33 



unlikely, but as information could not be obtained from the 

 patients themselves it seemed best to place them in a separate 

 class as uncertain. In Group C are placed 31 cases who have 

 been abroad at some period of life. One out of these was positive 

 for E. histolytica. The small number of persons in this group 

 necessarily makes the percentage of positives higher here than 

 in the other two : 



Group A. 

 Adults. Children, Group B. Group C 



Percent, infected witli : (210) (128) (92) (31) 



Entamoeba histolytica 

 E. coli . 

 JEndolimax nana 



' 1.4 1.6 0-0 3.2 



21.9 13.3 22.8 9-7 



2.9 4.7 1-1 3.2 



0-0 0.0 1.1 0.0 



lodamoeba butschlii 

 Giardia infestinalis 

 Chilomastix mesnili 

 Tnchomonas hominis 0.0 0-0 1.1 0.0 



3.8 39.8 4.8 0.0 



12.4 7-8 8.7 12.9 



Notes on the Cases infected with E. histolytica. 



Case I. 1. "Woman of 69. Has never been out of the country. 

 Was formerly in a mill, now does charing. Place of residence, 

 Leeds. Has had occasional attacks of diarrhoea, both lately and 

 in the past. This was a case showing precystic (' minuta ') 

 amoebae, average diameter 12-13 /i. (Also infected with E. coli 

 and Giardia.) 



Case I. 2. Man of 67. Never been out of tbis country. 

 Residence, Castleford. Never troubled with diarrhoea or any 

 other intestinal complaint. Cysts few, with an average diameter 

 of 13 fi. (Also infected with E. coli.) 



Case W. 3. Man of 66. This man was paralysed and had 

 great diificulty in speaking and making himself understood, but 

 as far as could be gathered it seemed very unlikely that he had 

 ever been abroad. Occupation, gardener. Residence, Leeds. No 

 history of dysentery or diarrhoea. Cysts few, 12-13 /i in diameter. 

 (Also infected with E. coli.) 



Case I. 4. Woman of 72. Fifty years ago had been in New 

 York. Used to take in sewing as an occupation. Residence, 

 Leeds. Never had any trouble with diarrhoea nor a day's illness 

 in her life until she entered the Infirmary for eye treatment. 

 Cysts few, average diameter 7-8 jx. (No other protozoa found.) 



Case I. 334. Boy of 11. Has never bimself been abroad, but 

 parents are Russian Jews. Never troubled with diarrhoea, and 

 seemed quite healthy and sturdy. Was in the Infirmary for 

 treatment of his eyes. Cysts few, average diameter 12 /z. (Also 

 infected with E. coli, E. nana, and Trichuris.) 



Case W. 335. Girl of 10. Tubercular. Never been out of the 

 country. Had no trouble with diarrhoea. Residence, Leeds. 

 Parents have never been abroad. Cysts few, 13 ji in diameter. 

 (Also infected with E. coli, Giardia, and Chilomastix.) 



