said he, or the like animal that has no Wings, has his arms set on his body in a quite opposite manner then Birds wings are; for the concave part of a Birds wing, which joins close to his body, is in man out∣ward; and the inward part of a mans arm where it joins to his body, is in Birds placed outward; so that which is inward in a Bird, is outward in Man; and what is inward in Man, is outward in Birds; which is the reason that a Man has not the same motion of his arm which a Bird has of his wing. For Flying is but swimming in the Air; and Birds, by the shape and posture of their wings, do thrust away the air, and so keep themselves up; which shape, if it were found the same in Mans arms, and other animals leggs, they might perhaps flie as Birds do, nay, without the help of Feathers; for we see that Bats have but flesh-wings; neither would the bulk of their bodies be any hinderance to them; for there be many Birds of great and heavy bodies, which do nevertheless flie, although more slowly, and not so nimbly as Flies, or little Birds: Wherefore it is onely the different posture and shape of Mens arms, and other Animals leggs, contrary to the wings of Birds, that makes them unapt to flie, and not so much the bulk of their bodies. But I believe, that a four∣legg'd Creature, or Animal, may more easily and safely go upright like Man, although it hath its leggs set on in a contrary manner to Mans arms and 0