. Animal physiology. Physiology, Comparative; Physiology, Comparative. DIGESTIVE APPARATUS OF INSECTS. 165 gizzard, whilst its own internal coat did not appear to be in the least injured. On the other hand it has been ascertained, that grain enclosed in metal balls which protected it from the mechanical action of the gizzard, but which were perforated so as to afford the gastric fluid free access to their contents, was not in the least digested ; so that the utility, and even the necessity of this operation, become evident. 202. As there are few animals, save the Mammalia, that perform any pro
. Animal physiology. Physiology, Comparative; Physiology, Comparative. DIGESTIVE APPARATUS OF INSECTS. 165 gizzard, whilst its own internal coat did not appear to be in the least injured. On the other hand it has been ascertained, that grain enclosed in metal balls which protected it from the mechanical action of the gizzard, but which were perforated so as to afford the gastric fluid free access to their contents, was not in the least digested ; so that the utility, and even the necessity of this operation, become evident. 202. As there are few animals, save the Mammalia, that perform any proper mas- tication in their mouths, the grinding down of their food (where it is of such a nature as to require it) must be per- formed in their stomach ; and accordingly we find many tribes, belonging to different divisions of the animal king- dom, in which a gizzard, or something analogous to it, exists. It is possessed by almost all the Cephalopoda, and by many of the Gaster- opoda. In the walls of the stomach of one of these last, there is a considerable amount of mineral matter deposited; intermixed with the hard tendinous fibres of which they chiefly consist. A powerful gizzard is also found in many Insects, but here it is placed above the di- gestive stomach (Fig. 110, c). The accompanying figure ex- hibits the alimentary canal of a Beetle, from its commence-. Fig. 110.—Digestive Apparatus of Beetle,. 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 Carpenter, William Benjamin, 1813-1885. London : Wm. S. Orr and Co.
Size: 998px × 2504px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorcarpenterwilliambenja, bookcentury1800, bookdecade1840
