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1 From the Merck Institute for Therapeutic Research, Rahway, N. J.
1. Quinine, quinidine, cinchonine and cinchonidine show about the same activity against the schizonts of P. lophurae in Pekin ducklings.
2. Quinoidine is considerably less active than the four crystalline cinchona alkaloids.
3. Two samples of totaquine varying widely in their quinine content were as active as quinine in duck malaria.
4. There is little difference in the acute oral toxicity for mice among the four crystalline alkaloids. Quinoidine is more toxic than the crystalline alkaloids.
Submitted on March 23, 1943