Not long ago the Yellow Fever Institute of the U. S. Public Health and Marine-Hospital Service issued the Report of Working Party No 1, in which is described a protozoan parasite found regularly in certain mosquitoes that had bitten yellow-fever patients. This organism is described in detail and given the name of Myxococcidium stegomyiœ. On the face of it this report appeared to be one of the most important contributions yet made to the much-vexed question of the etiology of yellow fever. The question was, Would it stand the test of scientific criticism?
In this number of The Journal Dr. James Carroll of the U. S. Army brings forward certain facts that tend to weaken one's confidence in the soundness of the conclusions of Working Party No. 1. Dr. Carroll shows that the fusiform stage of the Myxococcidium stegomyiœ can not be connected with the transmission of yellow fever, and