By Vincent B. Wigglesworth

This e-book could be of curiosity to entomologists and animal physiologists.

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Mones to The precise part that it plays in these functions is not really under- probable that the composition of the blood may vary enormously with the state of nutrition and, notably, during moulting and metamorphosis when many of the larval tissues are breaking stood, but it is THE CIRCULATORY SYSTEM down and 35 the cells of the fat body are yielding up their protein and The blood must also be regarded as an important fatty contents. reserve of food material: in the larva of Dei/ephila, during fasting, the protein in the blood is rapidly consumed; and during pupal life in the same insect more than half the total energy metabolism is effected at the expense of the blood.

In the blood-sucking forms (Cimex and RJwdmus) (Fig. 7, F), digested in this part of the mid-gut, but is merely concentrated by the removal of fluid, and the concentrated the food is not at all INSECT PHYSIOLOGY 42 product passed on for digestion to the long narrow intestine. In these insects the fluid that is absorbed passes into the blood and then excreted by the Malpighian tubes; but an advance on this mechanism has been developed by many Homoptera (Cicadoidea, Coccoidea, &c). These feed on the juices of plants, and therefore receive a great excess both of water and of sugars.

We have seen, also, that the blood probably plays a considerable part in the carriage of carbon dioxide from the tissues (p. 15). But here again there seems to be no chemical provision for its transport; the bicarbonate and the carbon dioxide capacity of insect blood are special adaptation to life in poorly oxygenated waters both very low. Organs and tissues associated with the blood The blood itself is an important recognized as such because the tissue; cells but of which it it is is not commonly composed are free and unattached and, with the exception of the 'phagocytic organs' (p.

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