36. _At six weeks_, two more incisors are generally cut in either jaw, and those which originally seemed to grow from the sides, have, by this time, taken a position more directly in the front of the mouth. 37. _At six months_, the incisors have moved almost into the situation they will hereafter occupy, and the jaw appears somewhat elongated; but, if the gums be observed, it will be seen that nature is preparing to cut the corner milk teeth, which may even be through the gum. 38. _At nine months old, the corner milk teeth are up, but their edges do not yet meet._ The coloured engraving will show the appearance they present, and likewise exhibit the protruded state of the gums at this age. The drawing was made from a head in the author's possession. It has been tested several times, and its correctness fully ascertained. The last occasion, when it was authenticated, was by the mouth of a bay colt, by Muley Moloch, out of Canaletti's dam, with which it perfectly agreed. [Illustration: _NINE MONTHS OLD._ _The Corner Milk-teeth up, but their edges do not yet meet._] [Illustration: _TWO YEARS OLD._ _A full Mouth of Milk Incisors, all of which show considerable wear._] 39. _At one year_, all the temporary teeth are up and in apposition; but by this time two pairs of permanent teeth, which are the fourth molars, have made their appearance, and the yearling therefore has sixteen molars and twelve incisors, or twenty-eight teeth. The large number of yearlings annually brought into the market afford such frequent opportunities of examining the mouth at this age, that I need not state here the means by which the drawing has been authenticated. It would be a task of supererrogation to allude further to a fact which is so well known and thoroughly established. 40. _At eighteen months_, the incisors show some wear, the infundibula look as if they would soon be obliterated; indeed some of them may be lost. At or about this time also four more permanent molars, one on each side of either jaw, being the fifth in situation, protrude into the mouth.