The corpus cardiacum of Locusta consists of a syncytium containing nuclei of two sizes. The most obvious cytoplasmic inclusions are spheroid bodies, mostly about 0.6µ in diameter, which are easily seen in the living tissue, especially by phase-contrast microscopy. They do not appear in routine microscopical preparations, but are blackened by the classical ‘Golgi’ techniques. They give positive reactions for phospholipines. The cytoplasm also contains very numerous minute granules, which appear to be mitochondria.

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