A Study of Certain Metabolic Intermediates in the Normal and Ddt-Poisoned House Fly Adult1

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Abstract
Although the existence and indispensable role of certain metabolic intermediates in animal tissues has become well established, very few of these investigations have been carried out using insect tissue. For example, insects were omitted from the classic invertebrate studies of Eggleton and Eggleton (1928), Meyerhof and Lohman (1928a, b), Meyerhof (1928), and Needham et al. (1932). Interest in the wing muscles of flying insects, unparalleled in the animal kingdom for their high rate of contraction and relaxation, led Baldwin and Needham (1933) to study the phosphorous distribution in the thoracic muscles of adult Calliphora and Lucilia flies. Before this work was finished, a paper by Schμtze (1932) appeared in which he reported having examined insect muscles of Locusta, Dytiscus, Hydrophilus, Lucanus, Apis and Aeschna and found arginine phosphate to be present, relying however, only on the evidence of the rate of hydrolysis. He also analyzed for lactic acid. Heller (1936) studied the phosphorous compounds in the larva and adult of the sphingid hawkmoth, Deilephila euphorbiae (Linn.).

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