50. _At seven years off, the corner teeth, without showing age, exhibit further evidence of wear._ The coloured engraving to which the reader must refer, exhibits those alterations which have now taken place. The original sketch was made from the mouth of a horse in the possession of the author's father, and having been corroborated by the inspection of numerous others, it is confidently put forward as characteristic of the age. I cannot here forbear from acknowledging the personal kindness and professional attention bestowed upon me by Mr. Percival, who, on being made aware that I was engaged upon a work illustrative of the horse's teeth, not only allowed me to inspect the mouths of the animals under his charge, but honoured me by accompanying me and assisted my endeavours to arrive at a just conclusion by his remarks. I have also to express my thanks to Mr. Braby for the liberty to inspect the large stud of heavy dray horses in the stables of Messrs. Barclay and Perkins, the eminent brewers. The advantages I derived from comparing so many mouths of the same age at the same time, and the facilities which were given of minutely examining each, enable me with more certainty to speak upon a subject which otherwise it would have been prudent to mention only in the most qualified terms. However, after such ample investigation, I can, with confidence, refer to the plate depicting the mouth at seven years off. Looking at it, the reader will see the teeth have become more white, in consequence of the crusta petrosa having, by the natural wear, been to a greater extent removed. The tushes are exhibited as fully up, in which condition they are generally seen. Where the corner teeth meet, they close in such a manner as denotes considerable use. The way in which the gums encircle the necks of the shell teeth has also changed. By referring back to the engraving of the five-year off mouth, the difference will be more readily understood, the round arrangement of the gums at the earlier age being very significant. The tables of the teeth, however, at this period ought never to be overlooked; they afford, perhaps, the best indications on which the judgment can be based. The infundibula may or may not be gone in the lateral teeth; but those of the corner teeth have at this age become defined. Where the corner teeth meet, in consequence of those of the lower jaw being, in many horses, a little the most forward, the upper shell teeth may present posteriorly a small projection, which is seldom seen prior to the seventh year. When this is present, it is so obvious as not to escape observation, therefore, it has not been depicted in the coloured engraving, which has purposely been made to represent the less marked indication that is more difficult to judge by. The reader will see the projection alluded to slightly indicated in the previous coloured engraving, portraying the mouth at six years off. Where the two shell