2. The four first differences also in the passage I have quoted are very slight, or ill-founded. The first is the difference of size, which character is very uncertain, especially as the author himself observes that his animal was very young. The second, third, and fourth, are drawn from the form of the nose, the quantity of hair, and other trivial circumstances. It is the same with many others, which may be retrenched; for example, the twenty-first character is drawn from the number of the teeth. It is certain that both this animal and man have the like number of teeth, and if the one in question had only twenty-eight, it ought to be attributed to its youth, for we know that the human race have not more in the early part of their days. 3. The seventh difference is likewise very equivocal; the scrotum of children is in general very tight, and this animal being young ought not to have had them pendulous. 4. The forty-eighth character of resemblance, and the twenty-first, twenty-second, twenty-third, twenty-fourth, and twenty-fifth marks of difference, only denote the presence or shape of certain muscles, which as they vary in most individuals of the human species, ought not to be considered as essential characters. 5. Every difference and resemblance drawn from parts too minute, such as the apophyses of the vertebræ, or that are taken from the position and magnitude of certain parts, should be considered only as accessory characters; so that Tyson's whole anatomical table may be reduced to the essential differences and resemblances which we have already mentioned.