. Dairy stock; its selection, diseases, and produce, with a description of the Brittany breed. Cows; Cattle. CHANGES IN PEEMANENT TEETH. 33 Though the molars are rarely examined, I may mention that Professor Simonds has observed that the first permanent molars, that is to say, the fourth in position on each side of each jaw, are put up when the calf is six months old; the fifth in position at fifteen months, and the sixth at two years, an interval of nine months elapsing between each. The second period of the second dentition is that in which the incisor teeth undergo a manifest change in thei
. Dairy stock; its selection, diseases, and produce, with a description of the Brittany breed. Cows; Cattle. CHANGES IN PEEMANENT TEETH. 33 Though the molars are rarely examined, I may mention that Professor Simonds has observed that the first permanent molars, that is to say, the fourth in position on each side of each jaw, are put up when the calf is six months old; the fifth in position at fifteen months, and the sixth at two years, an interval of nine months elapsing between each. The second period of the second dentition is that in which the incisor teeth undergo a manifest change in their wearing aspect, whereby the age of a co^^ can be told. Tliis period extends from five to nine years of age, and annually each succeeding pair is ob- served worn down, acquiring the aspect drawn Fig. 9. In the third period of the second dentition the form of the teeth completely alters ; the upper surface be- comes progressively narrower and flatter. The teeth D. 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 Gamgee, John, 1831-1894. Edinburgh, T. C. Jack; [etc. , etc. ]
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Keywords: ., bo, bookcentury1800, bookdecade1860, booksubjectcows, bookyear1861
