He is certainly right in his own sphere; so far as his observations have extended, his conclusion cannot be overthrown. To the information he has generously afforded the author, allusion will repeatedly be made in the course of this work; but at present the remarks must be confined to the models in Mr. Goodwin's possession. One of these exhibits the mouth of a colt called Julius, (which was ridden by Her Majesty) retaining the lateral milk incisors, when but a few days were wanting for the completion of the fourth year. The teeth that should have been shed, however, are evidently on the eve of leaving the jaw, and therefore though an exception, it is not so much so as to grossly mislead the judgment beyond a few months. It is to be regretted that the molars of this horse were not examined, and to the tables of the incisors, as shown in the model, I make no allusion, because these parts evidently have not received the particular attention of the artist, and consequently cannot be argued upon. The same gentleman has also favoured me with the inspection of a model of the teeth of a horse known to have wanted three months of the third year: nevertheless the mouth is that of a colt which would be pronounced to be "rising four." The lateral incisors on both sides, and in both jaws are fully up, and they possess tables, which, if correctly depicted, indicate that for some time they have been in apposition. A lusus naturæ of this sort is beyond the pale of reason. Connected with it there is no record of the development of the molars; and on the state of the tables as shown in the cast, I am, for the causes before stated, not inclined to place any great reliance. The growth of the incisors shows the colt to be "rising four;" the evidence declares it only to be "coming three." Here is an exception to a general rule: one which I believe is unique; at all events I am aware of the existence of no similar specimen; and it is to be lamented that the growth of the incisors, from the earliest period, had not in this horse been observed. As a unique specimen it is curious, but as a premature and extraordinary development, it cannot be opposed to a general rule. Children have been born with three legs, or joined together at various parts; but the race of men are nevertheless described as having two inferior extremities, and as being independent in their existence. A solitary instance is no more than a curiosity, and, until it is proved to be the exemplification of a general rule, must not be made the basis of a general deduction. Such occurrences, however rare, nevertheless deserve consideration; and had the animal last alluded to been trained, there is no doubt any qualified judge would have pronounced it beyond the actual age. Therefore, gentlemen possessed of racing studs, should, from time to time, have the mouths of their horses examined by approved members of the Royal College of Veterinary Surgeons, that any irregularity of development may be known