Note--A mare having been served by a stallion may occasionally in the course of four or five weeks, manifest a desire for a second visit from the male; is again served and conceives both times. This is known as superfoetation. Such a case has been recorded by a veterinarian; the animal in question, a mare, giving birth to a horse colt and a mule colt, both dead. The mare had been covered by a jack and subsequently by a horse. SIGNS OF PREGNANCY.--The veterinarian is occasionally called upon to give an opinion as to the pregnancy or non-pregnancy, of an animal and consequently should familiarize himself with the various indications which tend to prove the absence, or presence, of this condition. As a rule, when the mare conceives, heat, or the desire for the male, is no longer observable, and, on being led to the horse, she not only refuses to receive his caresses, but assumes the offensive, viciously striking and biting at him until led away. Soon the hair becomes more glossy, and the mare becomes quieter in disposition. This change is usually well marked in mares that are of a vicious disposition. The abdomen gradually enlarges as pregnancy advances, the right side being a little larger than the left. This enlargement is especially well marked in the cow. In some cases the beating of the foetal heart may be heard with the assistance of the stethoscope. Such an examination is, however, very likely to give rise to mistakes. After the eighth month well-marked symptoms of pregnancy are manifested, the belly at this time being considerably distended, the back sinking, etc. Before this time it is, however, impossible to make a positive statement as to the condition of the animal except by making a very close and thorough examination per rectum. The rectum should be cleared out by means of an enema (injection) of tepid water; the hand and arm should be well oiled and passed into the rectum. The region of the uterus being reached, an examination may be made of its condition. As the time for parturition approaches, the ligaments relax to a greater or less degree, and a well-marked depression or sinking in the lumbosacral region may be observed, the udder or bag enlarges, and milk is secreted. The secretion of milk sometimes appears long before the time of parturition, and has frequently been noticed to take place in animals that have never been bred. As a rule the animal shows slight uneasiness for a day or two before parturition, slight abdominal pain, etc., being manifested. About this time the vulva becomes larger, and presents more or less tumefaction. There may also be observed a flow of mucous taking place from the vulva for a day or two before parturition. INDEX HORSE Descriptive Anatomy, 5 Dissection, 6 BONES