41. _At two years old, there is a full mouth of milk incisors, all of which show considerable wear._ The coloured engraving of the two-year old mouth, will convey an accurate idea of the features which it presents at that age. The original drawing was made for the Jockey Club in anticipation of the celebrated Running Rein trial. Accepted by such authority, it perhaps hardly requires further proof of its correctness, but it has since been repeatedly tested. On the last occasion it was compared with the mouth of a chesnut filly, by Calmuck out of Miss Greatrex, and was found to agree with the indication therein presented. At two years, the infundibula are lost in the temporary incisors, and the fifth molars are in perfect apposition; indeed the smooth surfaces of these last are the best evidence that the animal is two years old, for he cannot then be far below that age. The incisors having been for some time employed, but still being to be retained for some months, have an aspect of wear and strength conjoined. The two-year old mouth, therefore, by those who cannot distinguish the milk from the horse teeth, (none of the latter being present to help the judgment by the contrast they exhibit) is likely to be mistaken for that of a five-year old; especially if the colt chances to be somewhat fully developed. A regular horseman, however, would not require the aid of the mouth to discover the animal was still in its colthood. 42. _At three years old, the centre horse teeth are well up, and are distinguished by their size, shape, and colour._ The appearance which the mouth will exhibit, the coloured engraving represents. The original drawing is in the possession of the Jockey Club, for whom it was made. It has, however, been repeatedly tested, in order to place its correctness beyond doubt. Both colts and fillies have been inspected for this purpose, and equally have the different breeds been consulted. As the public, however, place the greater confidence in blood stock, it may here be mentioned that the appearances perfectly coincided with those exhibited by a brown colt by Muley Moloch out of Miss Greatrex, and Roxey, a brown filly, by Lanercost, out of Ellen Percy, besides various others which it would be both needless and tedious to recapitulate. The mouth, at this period, indeed is so marked, and in general so regular, that it is the more readily recognized. The new horse incisors, by their size, contrast with the milk teeth which are still retained. The comparative length and squareness of their figure cannot fail to attract attention, and their deeper colour can hardly be unobserved; that colour is caused by much of the primitive coating of crusta petrosa being retained, or only removed from the edges where the enamel is bright. But as a vast number of horses are sold at this age, and many are started for heavy stakes, it will be imperative now to proceed more cautiously in the description. About this time the terms