There is but a single character in all this description which indicates that the Calmuck Cows are of a particular species, which is their grunting instead of lowing, for as to all the rest, they so strongly resemble the bisons, that I do not doubt they are of the same species, or rather the same race. Besides, though the author says that these cows do not low but grunt, yet he acknowledges they do that only very seldom; and this was, perhaps, a particular affection of the individual he saw, for Rubruquis, and others whom he quotes, do not speak of this grunting; perhaps the bisons, when they are irritated, have also an angry grunt; even our bulls, especially in the rutting season, have a hollow interrupted voice, which much more resembles grunting than lowing. I am, therefore, persuaded that this grunting cow (_vacca grunnicus_) of M. Gmelin is no other than a bison, and does not constitute a particular species. 3. THE TOLAI. This animal, which is very common in the country which borders on the Lake Baikal, in Tartary, is a little larger than a rabbit, which it resembles in figure, colour of the hair, taste of the flesh, and in the habit of burrowing in the earth to conceal itself. Their internal structure is also the same, and they differ only in the tail, which is considerably longer than that of the rabbit; it, therefore, seems very probable that it does not really constitute a different species, but is only a variety in that of the rabbit. Rubruquis, speaking of the animals of Tartary, says, "There are rabbits with long tails, which have black and white hairs at the end. There are no stags, few hares, many gazelles, &c." This passage seems to indicate that our short-tailed rabbit is not to be met with in Tartary, or rather that it has undergone some variations in that climate, and especially in the length of the tail; for as the tolai resembles the rabbit in every other respect, I do not think it necessary to consider them as a distinct and separate species. 4. THE ZISEL.