45. At four years, four pairs of horse teeth are well up, but the corner milk teeth are retained. Such a state of the mouth is very characteristic of the age, and not likely to be mistaken. The appearance which the teeth present, if viewed from the front when the lips are separated, is shown in the coloured engraving, and it is such as no person can well mistake. The original drawing in this case was also made for the Jockey Club, and was produced upon the famous trial. On all occasions that presented themselves, which have indeed been numerous, it has been compared with the mouths of living animals, and in no single instance has it been found to be contradicted. This has not only been done with colts, but also with fillies, among which last I may mention Lupine, Mora, Nightcap, Chamois, and Jew Girl. To the plate, therefore, the reader should refer; and supposing him to have done so, the other indications which the mouth presents between the third and fourth year will now be enlarged upon. The state of the molars at this period may be regarded as demonstrative of the age of the animal. The reader will remember, that according to what has been pointed out, the colt at three years old has five molar teeth on either side of both jaws, and that of these teeth, one only, the third in situation, marked thus, 4* in the frontispiece, is of a temporary nature. Shortly after the upper lateral milk incisors have been cast off, and sometimes previous to that occurrence, the point of the sixth molar penetrates through the gum, and before it is fully up the covering of the third permanent molar is removed. This effected, the colt has six molars on either side of both jaws, and whenever that number is found they may be assumed to be all of a permanent character; so at four years old the tables of the central incisors exhibit some considerable wear, the infundibula no longer extend entirely across, but have become circumscribed and well defined. The tables of the lateral incisors, on the contrary, are only beginning to be formed, and very often the part posterior to the infundibulum has not received any attrition. The infundibula in these last extend the entire breadth of the table, and in consequence of an indentation on that side which touches the corner milk teeth, the space is there free. The reader will comprehend this particular formation, by referring to the wood-cut of the table of the tooth presented at page 79, the appearance being so much alike as not to necessitate a repetition to enforce it. When the fourth year, however, has been for a month or two perfected, the tables then assume the form represented in the following wood-cut, which exhibits the change that has taken place in the central incisor, and also the appearance of the more recent lateral tooth when the colt is fairly four years off.
One or more of the tushes may also be well up: the whole may have made their appearance; but more frequently only the two originating from the lower jaw are through the gum. No dependence, however, can be placed on the presence or absence of the tushes, which repeated proof has shown to be irregular in their development: nor is the state of the mouth during the fourth year such as justifies an off-hand opinion being pronounced; for though during that period the growth of the teeth is generally well marked, nevertheless exceptions more frequently happen than between the second and third years. An instance illustrative of this fact occurred at the Veterinary College, at St. Pancras, during November, 1844. To that Institution was brought a dun colt, which the professors, one and all, pronounced to be “rising three.” Mr. Robb, a gentleman of great talent, and then a pupil at the school, having looked at the animal’s mouth, pronounced it to be “three off,” or “rising four.” Here was a difference of opinion to the extent of a whole year; and of course the pupil was sneered at for his ignorance and presumption. Mr. Robb, however, had reasons for his conviction; he would not give up the point, but wrote to the breeder, and obtained a reply which showed the teachers had yet to learn. Being an acute observer, Mr. Robb had attended to the wear of the tables; had seen the infundibula had become defined, and the surrounding surface broad. He had also remarked the gums, and seen that those of the lower jaw were slightly red; and, taking these tokens in conjunction with the appearance of the colt, arrived at a conclusion which the result proved to be correct, and which did not show the mouth deficient in its symbols. Mr. Goodwin, veterinary surgeon to the Queen, has casts of mouths taken from horses of known ages. No gentleman connected with the veterinary profession, perhaps, has enjoyed such peculiar opportunities as Mr. Goodwin, and no one could be characterized by a greater inclination to take advantage of them. With a natural talent for observation, and an innate love for scientific inquiry, combined with enthusiasm in the cause of truth, Mr. Goodwin has, in the midst of ill health, pursued his researches, and spite of an opposition, which did not stop short of calumny, fearlessly advanced his opinions. Those opinions, Mr. Goodwin’s position, and his acknowledged ability should have claimed consideration for. The conclusions which had not been hastily arrived at, ought to have been deliberately weighed. The author of this work is proud to acknowledge the obligation under which the courtesy of Mr. Goodwin has placed him, and with pleasure confesses that he has, in that gentleman’s society, learned much upon a subject which he had previously diligently studied to become the master of. The facts which Mr. Goodwin brings forward in support of his convictions, are strange and startling. The candour with which he courts investigation, enforces belief. 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 and stated. To neglect so simple and reasonable a precaution, is to incur a needless hazard. By adopting it, the proprietor would be prepared to meet objection; and the idle reports that every year get into circulation would be quashed at their birth. A firmer basis for the authenticity of the age would be established than the reputation of the owner; and gentlemen would not annually be subjected to having their characters questioned by a host of interested ignoramuses. The turf is bound to adopt some measure of this kind for its own defence, especially as the honour of its members is, on every occasion, called into question, and a single instance of suspicion, seems, in the public eye, to warrant a general aspersion.
46. When rising five years old all the horse teeth are in the mouth, but the corner teeth have yet to meet. The peculiar sign of this particular age is the loss of the corner temporary incisors. It is scarcely possible to mistake the last milk tooth of the four year old, for the horse incisor which is characteristic of the fifth year; the difference between them is so great, that no person ought to confound one with the other. The corner milk tooth is often by the third year worn almost to a stump; its table being somewhat triangular, or occasionally round. By the fourth year it generally becomes a mere stump, or so changed in appearance that it contrasts in size with the other nippers, and seems incapable of performing any active function. At first, the permanent tooth when it makes its appearance, strikes us by its greater breadth, the gum not then having sufficiently retracted, or the tooth sufficiently grown to allow its after length being estimated. When the corner teeth are in the mouth, some time will elapse before they touch, but the incisors are then arranged so as to represent almost a semi-circle. The annexed wood-cut will convey an idea of the manner in which they are placed, and also of the shape of the tables of the central and lateral nippers, at the time when the corner teeth do not approximate, although they are through the gums.
The periods when the teeth which characterize the fifth year make their appearance, must now be described. When the animal is four years and three months of age, the gums of the upper corner teeth begin to redden, and before it is three months older, one of the corner milk teeth may have been removed. The opposite milk tooth speedily follows, and then the corner horse incisors grow down, and seem almost to be fully developed before the corner milk teeth of the lower jaw are shed. When, however, all the milk teeth are lost, the corner incisors will not touch for some time; and by the completion of the fifth year, though the teeth approximate, their tables are not formed, nor do their edges denote any amount of attrition. The corner tooth at five years old, looks young, and is principally covered by the membraneous crusta petrosa, which give to it a dark aspect, as though it were encrusted with tartar, little of the enamel being to be seen, while the shape of the gum is also characteristic. The five year old mouth, therefore, is easy of recognition, the shelly character of the corner teeth being very marked and not subject to much eccentricity in its figure. As five however, is the age when, for general purposes, the majority of high priced horses are brought into the market, the changes which take place before and after this period have been illustrated in the coloured engravings. When the animal is near to or rising five, the corner teeth are dark coloured, and though they touch, nevertheless their edges are not fairly together. The superior surfaces exhibit no tables, and the general aspect is such as is depicted in the engraving; the original of which was made from recollection of the appearances presented by the mouth of Mr. Payne’s Rebel, which horse was seen at Hampton Court. The drawing was more recently corroborated and corrected by the mouth of a fine young black hunter, the property E. C. Crowley, Esq. The peculiarities of this age, as denoted by the corner teeth not closing, should be remarked. It is not altogether unimportant to observe this circumstance, as animals are esteemed suitable for particular uses, only after the fifth year has been completed, and certainly all are less liable to disease when the mouth has been perfected. The distinction, therefore, is of some moment; and the better to enforce it, the reader will remember, that not until the accomplishment of the fifth year do the tables of the corner teeth begin to show: even at that time, however, they are very imperfect.
FIVE YEARS OLD.
A full Mouth of Horse Incisors,
all the edges of which fairly meet.
RISING FIVE YEARS.
All the Horse Teeth in the Mouth,
but the Corner Teeth have yet to meet.
47. At five years old there is a full mouth of horse incisors, all the edges of which fairly meet. The coloured engraving—which has been amply proved, by comparing it with the mouths of horses of various breed, among which those of blood have not been forgotten, since it was last tested by the aspect presented by the teeth of the well-known horse, The Baron,—will instruct the reader in the altered character which the mouth now assumes. It looks more huge, and far more powerful than it did at the fourth year. The teeth fairly close, but on inspection there can be detected slight signs of wear. The tables are not yet formed. The anterior edges alone are rendered level; all posterior to the infundibulum being as yet untouched. The tables then present the appearance indicated in the following wood-cut, which also represents the semi-circular order in which they are arranged.