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EXPLANATION OF PLATES XX-XXII 
PLATE XX. 
Photomicrographs, ah magnihed 1325 diameters, except Fig. 7, which is magnified 
820 diameters. 
Fig. 1. Entamoeba gingivalis, trophic form showing characteristic ingesta; the nucleus 
is seen on the left side of the amoeba as a ring of chromatin with a central granule. 
Stained. Iron-haematpxylin. 
Fig. 2. E. gingivalis form stained with safranin and licht-griin, and showing the feebly 
stained nucleus as a ring with central karyosome. The nucleus on the right side 
just overlies a more deepl}^ stained food body which is slightly out of focus. 
