. The comparative anatomy of the domesticated animals. Veterinary anatomy. 430 TEE DIGESTIVE APPARATUS IN MAMMALIA. They are worn more or less quickly, according to tlie kind of food the animal obtains, and are sometimes broken in fighting. The molars are distributed in the two jaws, twelve being fixed in the upper and fourteen in the lower.' Nearly all of them are terminated by somewhat acute lobes, proper for tearing animal food. The strongest in eacii jaw is, for the upper, the first back-molar or fourth in the row, and iu the lower, the fifth. All in front of these are deciduous. After ihe
. The comparative anatomy of the domesticated animals. Veterinary anatomy. 430 TEE DIGESTIVE APPARATUS IN MAMMALIA. They are worn more or less quickly, according to tlie kind of food the animal obtains, and are sometimes broken in fighting. The molars are distributed in the two jaws, twelve being fixed in the upper and fourteen in the lower.' Nearly all of them are terminated by somewhat acute lobes, proper for tearing animal food. The strongest in eacii jaw is, for the upper, the first back-molar or fourth in the row, and iu the lower, the fifth. All in front of these are deciduous. After iheir complete eruption from the alveolar cavities, the Dog's teeth are no longer pushed outwards. They are remarkable Fig. 242. for their brilliant whiteness, which they owe to the absence of cement on their covering of enamel. The Cat has thirty teeth . twelve in- cisors, four tusks, and fourteen molars, eight of which are in the upper, and six iu the lower jaw. All these teeth are constructed on the same type as those of the Dog. The canines are deeply striated on their ex- ternal surface, instead of being smooth. Rabbit.—It may be noted that in the rabbit there are two incisors in the lower jaw, and four in the upper, two of which are placed behind the principal two. I I \\:^?^s\ # V There are ten molars in the lower, and \i \ \\ jl twelve iu the upper, which are, in prin- 'l \ l\ ciple, as in the horse. H \ W /\ (The importance of a correct know- f \ (\ I I I le<ige of the period of eruption, shedding, * "^ ' ' replacing, and general wear of the teeth of the domesticated animals, as a guide to their age, induces me to give the table on p. 431 (from Leyh), as indicating at a glance the age at which the teeth appear, are shed, and replaced in the diflferent creatures. Baumeister divides the successive evolutions in the wear of the tables of the horse's incisor teeth into four periods —from six years to extreme old age. The first, the transversely oval period, extend
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