. Protozoo?logy. Protozoa; Protozoa, Pathogenic. THE PATHOGENIC HEMOSPORIDIA 287 cause of bird malaria, are not different in essentials from similar phenomena in human parasitic forms. Of great importance in the malaria problem is the fact of latent and recurrent malaria. In many cases, months after the first attack and apparent cure, the victim suffers anew from the parasites, and this without new infection. The matter has been studied carefully by many observers, among others by Craig and by Schaudinn, and it has been found that parasites, even after apparent cure, are stored up in the splee
. Protozoo?logy. Protozoa; Protozoa, Pathogenic. THE PATHOGENIC HEMOSPORIDIA 287 cause of bird malaria, are not different in essentials from similar phenomena in human parasitic forms. Of great importance in the malaria problem is the fact of latent and recurrent malaria. In many cases, months after the first attack and apparent cure, the victim suffers anew from the parasites, and this without new infection. The matter has been studied carefully by many observers, among others by Craig and by Schaudinn, and it has been found that parasites, even after apparent cure, are stored up in the spleen and the bone marrow, where they live a comparatively pas- sive existence, getting into the peripheral blood when the conditions for their further development are favorable. What these conditions are is the one remaining obscure point in our knowledge of the malaria organisms. Schaudinn claims that certain of the forms of Plasmodium vivax, which under ordinary conditions would form the macrogameto- FiG. 113. w > I ,1 V rf'f ^ —. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Calkins, Gary N. (Gary Nathan), b. 1869. New York and Philadelphia, Lea & Febiger
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