Excluding the 14 hamsters sacrificed within the first week, F-23 which was too much decomposed for examination and F-29 which escaped, the per os experiment registers an infection of 12 out of 14 hamsters—a result comparable to that (9 out of 11) obtained by the Indian workers. Young and his associates in Peiping, working with the same parasites used in these experiments, may have failed to produce infection per os because they did not grind and dilute the organs used,' thereby facilitating phago-cytosis and absorption; furthermore, they made no cultures of the organs of animals fed with Leishmania donouani.