. Comparative anatomy and physiology. n6 COMPARATIVE ANATOMY AND PHYSIOLOGY. food is brought into condition suitable for absorption, is unable to exercise its activity unless the food on which it acts is alkaline in reaction ; in other words, its activity is arrested in an acid solution. Now, the process of the decay of leaves is accompanied by the formation of several acids, which must necessarily be neutralised before the digestive fluids can act on the. Fig. 57.—Transverse Section of Earthworm to show the Position and Eelations of the Intestine. a, Cuticle; 6, hypodermis; c, layer of circul
. Comparative anatomy and physiology. n6 COMPARATIVE ANATOMY AND PHYSIOLOGY. food is brought into condition suitable for absorption, is unable to exercise its activity unless the food on which it acts is alkaline in reaction ; in other words, its activity is arrested in an acid solution. Now, the process of the decay of leaves is accompanied by the formation of several acids, which must necessarily be neutralised before the digestive fluids can act on the. Fig. 57.—Transverse Section of Earthworm to show the Position and Eelations of the Intestine. a, Cuticle; 6, hypodermis; c, layer of circular muscles : d, layer of longitu- dinal muscles; i. enteric cavity; m, "green layer"; n, dorsal vessel; o, " ; (After Clapardde.) ingested leaves; this neutralisation appears to be effected by the calcareous concretions on which the so-called humus acids readily act; the result of their union is an alkaline liquid. Below the calciferous glands the esophagus widens out into a crop, and this is succeeded by a gizzard, which is provided with powerful transverse muscles, and ordinarily contains, as has been already stated, small stones and grains of sand; by the powerful con- traction of its muscular walls and by the aid of these. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bell, F. J. (Francis Jeffrey), 1855-1924. London, Cassell
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondo, bookyear1885
