ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
57 
In a similar way the destruction of haematozoa by phagocytes was 
observed when frog’s blood was added to that of the bird. The para- 
sites of the bird are considered by the author to be allied to the malarial 
cytoparasites of man, and they are distinguished as the “malarial” 
parasites of birds. 
When frog’s blood is added to that of owls which contains infected 
corpuscles and melanin granules, a considerable number of the bird’s 
corpuscles are found to be taken up by the frog’s large leucocytes 
within twenty-four hours at 15°-18° C. The process of intracellular 
digestion goes on until the blood-corpuscles and its parasite have 
disappeared, the nucleus lasting a little longer. Finally, melanin 
granules are visible in the protoplasm of the phagocyte, which also 
shows an active vitality ; other and similar observations are recorded of 
mixing malarial bird’s blood with uninfected blood of birds and also 
with that of the dog. 
That birds suffer from malaria the author thinks is proved by the 
anaemia and melanaemia that occurs in them, and also from the brown 
and black colour of the spleen and bone-marrow, e. g. in ravens, magpies, 
and owls. Moreover the presence of melanin granules is easily demon- 
strated microscopically. 
