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Amoebicisis in a Monkey 
be quite normal. I may say at once that (microscopically and culturally) 
the pus of the abscess, the spleen juice, and the blood from the heart, 
did not show the presence of any bacteria. 
Description of the Amoeba. In fresh preparations from the pus of 
the abscess, the organisms, which were all of large dimensions, appeared 
moving slowty with the well-known amoeboid movements. The 
pseudopodia were short, blunt, rather slowly emitted and retracted; 
the distinction between endosarc and ectosarc was apparently not very 
marked. The whole body of the parasites appeared vacuolated; but 
no pulsating vacuoles were present. No nucleus could be distinguished. 
Some of the amoebae contained red blood corpuscles. 
Stained preparations. I stained several films from the pus of the 
abscess by means of the Romanovsky-Leishman method. The amoebae 
stain bluish, are oval or rounded, and measure 40 to 70 p. They 
occasionally contain red blood corpuscles which appear pinkish or 
yellowish when stained. In some of the amoebae the nucleus cannot 
be made out; in others it is small (3 to 6 p), contains some chromatin, 
is rounded, and occupies an eccentric position. I have not come across 
encysted or developmental forms. 
It is probable, from what has been said regarding the appearances 
presented by the intestines at autopsy, that this monkey had never had 
dysentery. 
I have seen several cases of spontaneous dysentery among monkeys 
where the intestinal contents contained amoebae which I believe to be 
identical with the species found in this liver abscess. 
This is the first time, however, that I have come across a liver 
abscess in a monkey. It is to be noted that amoebae maybe frequently 
found in the faeces of appai’ently quite healthy monkeys, a fact already 
noted by several observers; these amoebae, however, are morphologically 
different as they generally present a rather large, distinct nucleus, and 
are apparently non-pathogenic. 
In conclusion, it seems to me that the abscess of the liver found in 
the monkey was due to the amoebae I have briefly described, as 
neither the pus of the abscess, nor the spleen juice, nor the blood of 
the heart, was found ro contain any bacteria; either microscopically or 
culturally. 
For this amoeba I propose the name Entamoeba nuttalli, after 
Professor George H. F. Nuttall. 
