Experimentally Induced Changes in the Cell Complex of the Blood of Periplaneta Americana (Blattidae: Orthoptera)1

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Abstract
Insect blood corpuscles have been variously classified by different workers, Cuenot (1897), Hollande (1907), Berlese (1909), Tillyard (1917), but as Muttkowski (1924) has pointed out the names proposed can be reduced fairly well to a unified system. Muttkowski himself recognized but two general types among insect blood cells, the large lightly staining corpuscles and the smaller darker staining cells. He called the large cells amebocytes and the smaller ones chromophils and stated that the two types were connected by a series of intermediate corpuscles thus tending to show that all were derived from one primary cell element. He gave as his opinion that the amebocytes which he found to be highly vacuolated were old degenerating cells and that, the chromophils were more embryonic in nature and in the course of their cycle of life gave rise to the other kinds of cells found in insect blood.

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