52 



THE AMOEBAE LIVING IN MAN 



another " new species " called " E. brasiliensis." They were seen later 

 by Ujihara (1914) in Formosa, and correctly referred to E. histolytica. 

 Ujihara* apparently studied five different strains of E. histolytica, with 

 cysts of the following mean diameters approximately : 6'8 fi (i case), 

 8' 5 At (3 cases), 10*24 /* (3 cases), ii'95/a (7 cases), 13 "6 /a (4 cases) 

 Unfortunately the author does not state how many cysts he measured 

 from each case, nor how he made his measurements. It is impossible 

 to know what exact value to attach to his figures in consequence. 



6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 

 Text-Fig. i.— After Dobell and Jepps (1918). 



Nevertheless, there is a striking similarity between four of his races and 

 four of those which I studied with Miss Jepps, as will be apparent from 

 the following table : — 



Ujihara { 1 9 1 4) . Dobell and Jepps ( 1 9 1 8 ) . 



Race I ... ... 6*8 /i ... ... 6*6 m 



8-5 M 



10'24 M 



11-95 M 



8-3 M 



II "6 /It 



13*3 M 

 15-0/* 



* In my earlier papers (Dobell and Jepps, 1917, 1918) I unfortunately overlooked 

 the observations of this Japanese worker — partly, I think, because he himself did not 

 call attention to the significance of his findings, which were merely recorded in a table 

 with other data. I did not realize their importance until I recently le-read his paper. 



