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26 can be readily recognized in many (Fig. 12, 8), though not in all, of the cells, especially in those of the middle lobe, and also free in the contents of the ducts. So numerous are they in some of the cells that the appearance they present is suggestive of a bacillus-laden lepra cell.

Fig. 14.—Dissection of head of mosquito.

By a large number of experiments, abundantly confirmed, Ross distinctly proved that if appropriate birds are bitten by mosquitoes whose salivary glands contain the sporozoites of the avian plasmodium, the birds become infected with the parasite, and in