. On the anatomy of vertebrates [electronic resource] . erage course of development and suc-cession of the teeth in the Equus Caballus :—The summits ofthe first functional deciduous molar ( first grinder of veterinaryauthors) are usually apparent at birth; the succeeding grinder2sometimes rises a day or two later, sometimes together with the first. Their appearance is speedilyfollowed by that of the first decidu-ous incisor, fig. 282, d l (< centrenipper of veterinarians), which usu-ally cuts the gum between the thirdand sixth days; but occasionally pro-a, trudes at birth. The second decidu
. On the anatomy of vertebrates [electronic resource] . erage course of development and suc-cession of the teeth in the Equus Caballus :—The summits ofthe first functional deciduous molar ( first grinder of veterinaryauthors) are usually apparent at birth; the succeeding grinder2sometimes rises a day or two later, sometimes together with the first. Their appearance is speedilyfollowed by that of the first decidu-ous incisor, fig. 282, d l (< centrenipper of veterinarians), which usu-ally cuts the gum between the thirdand sixth days; but occasionally pro-a, trudes at birth. The second deciduousincisor, ib. d 2, appears betwreen thetwentieth and fortieth days, and aboutthis time the rudimental molar,3comes into place, and the last de-ciduous molar4 begins to cut the the sixth month the inferiorLower lateral or third incisors, ib. d 3, with the deciduous canine make their appearance. The lower minutecanine is shed about the time that the contiguous incisor is in 1 The homologue of d fig,2 . 287. 2 Ib. d 3. 3 Ib. d 1. 4 Ib. d TEETH OF UNGULATA, place. The upper deciduous canine is shed in the course of thesecond year. The rise to working level of the third deciduous in-cisors ore corner nippers completes the stage of dentition called the4 colts mouth by veterinary authors, fig. 282. The deciduous inci-sors are not only smaller than the permanent ones, but are whiter,have a better markedi neck, the fang more slender and pointed, andare devoid of the median longitudinal groove. The first permanent 283 284l
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