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Updated: May 22, 2025
Delia took no personal care of it whatever leaving all this to the nurse. It happened one day that I was called in to see the child. I found it suffering from some of the ill effects of difficult dentition, and did what the case required. There was an old friend of Delia's at the house a young lady who had been much attached to her, and who still retained a degree of her old friendship.
Hence the form of dentition in man is very important. In the fully developed condition we have thirty-two teeth; of these eight are incisors, four canine, and twenty molars. The eight incisors, in the middle of the jaws, have certain characteristic differences above and below. In the upper jaw the inner incisors are larger than the outer; in the lower jaw the inner are the smaller.
The regularity and evenness of the dentition of the Anoplotherium, as contrasted with that of existing Artiodactyles, and the assumed nearer approach of the dentition of certain ancient Carnivores to the typical arrangement, have also been cited as exemplifications of a law of progressive development, but I know of no other cases based on positive evidence which are worthy of particular notice.
It is well to keep the following table of dentition in mind when examining the mouths of animals for the purpose of determining their age. Horses Cattle Hogs Teeth Temporary Permanent Temporary Permanent Temporary Permanent Incisors: yrs. mos. yrs. mos. mos.
Until puberty this children's hair remains the same, although at times, particularly after dentition, and after infectious diseases which undoubtedly alter the relations of the internal secretions, changes of color and texture occur.
The fact that the dentition of the older tertiary ungulate and carnivorous mammals is always complete, noticed by Professor Owen, illustrated the same generalisation. Another no less suggestive observation was made by Mr.
But in the fact that there are only six full-sized grinders in the lower jaw, the first premolar being very small; that the anterior grinders are as large as, or rather larger than, the posterior ones; that the second premolar has an anterior prolongation; and that the posterior molar of the lower jaw has, as Cuvier pointed out, a posterior lobe of much smaller size and different form, the dentition of Anchitherium departs from the type of the Palaeotherium, and approaches that of the Horse.
I may remark that Rütimeyer has shown that several wild mammals in Switzerland since the neolithic period have had their dentition and, I think, general size slightly modified.
Thus they all have the same number of teeth as man possessing four incisors, two canines, four false molars, and six true molars in each jaw, or 32 teeth in all, in the adult condition; while the milk dentition consists of 20 teeth or four incisors, two canines, and four molars in each jaw.
A striking peculiarity of their dentition, one in which they differ from all other quadrupeds, consists in their having a single large pre-molar, the enamel of which is furrowed with vertical grooves, usually seven in number. Plagiaulex Becklesii, Falconer. Middle Purbeck. Right ramus of lower jaw, magnified two diameters. a. Incisor. b, c. Line of vertical fracture behind the pre-molars. pm.
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