. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. NUTRITION PROPER. upward {b and c) until the edges meet above and are sol- dered ; pt is the poison tube. That this peculiar structure was gradually formed is shown by the fact that all the steps of the process may ft be found among living ser- pents — viz., teeth slightly grooved, deeply grooved, and tubulated. All degrees of virulence of the poison may be found. The poison gland is probably an extreme modification of a salivary gland, and the poison of saliva. The saliva is slig
. Outlines of the comparative physiology and morphology of animals. Anatomy, Comparative; Physiology, Comparative. NUTRITION PROPER. upward {b and c) until the edges meet above and are sol- dered ; pt is the poison tube. That this peculiar structure was gradually formed is shown by the fact that all the steps of the process may ft be found among living ser- pents — viz., teeth slightly grooved, deeply grooved, and tubulated. All degrees of virulence of the poison may be found. The poison gland is probably an extreme modification of a salivary gland, and the poison of saliva. The saliva is slightly poisonous in many animals. Observe again, third, that the fang is formed in a fold in the gum, and at first loose, but afterward fixed to the jawbone. Also that in the fold there are many subordinate folds, in each of which. Fig. 192.—A longitudinal section of the fang of a serpent: the cross sections show mode of formation of the poison tube ; pt, poison tube ; tc, tooth cavity ; pg, poison gland. on,. 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 LeConte, Joseph, 1823-1901. New York, D. Appleton and Company
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