Numerous investigators have found amebas in the stools of healthy persons, but, since they have mostly made no distinction between Entamœba coli and Entamœba dysenteriœ, their results can not be considered in this connection.
Schaudinn,1 however, examining the stools of healthy individuals, demonstrated the presence of the Entamœba coli in the stools of 50 per cent. of those examined in West Prussia, in 20 per cent. of those examined in Berlin, and in 66 per cent. of those dwelling on the shores of the Adriatic.
Craig2 demonstrated the presence of Entamœba coli in the stools of healthy individuals in 65 per cent. of the cases and in 50 per cent. of the 150 cases examined of patients suffering from other than intestinal disease.
These results would seem conclusively to demonstrate the fact that the Entamœba coli is an extremely common intestinal parasite and the strong probability of its