Many of my observant readers have already discovered for themselves where and what these numerous legs and feet are. In the early days of my ophidian studies, which then consisted chiefly of observations, I noticed the action of limbs beneath the skin of the pythons as they moved about, and more particularly when they were climbing up the glass in front of their cages, and as in the case of the glottis, I thought I had made a grand discovery; and so I had, as far as myself was concerned. Deductions from personal observation, which in the history of many sciences have again and again been claimed as original discoveries by rival thinkers or experimentalists, no doubt _were_ original on the part of each. Probably, also, many other persons have noticed this leg-like action of the ribs, but who, not being specially interested in snakeology, have never troubled themselves to ascertain ‘further particulars,’ or cared whether any one else had observed this or not. But it _is_ a very evident and unmistakeable action, and one quite worth studying on your next visit to the Reptilium. Books on ophiology tell us that Sir Joseph Banks was the first to observe this limb-like action of the ribs. Sir Everard—then Mr.—Home, F.R.S, and the most distinguished anatomist of his time, was, however, the first to publish a scientific description of the fact; his account and the illustrations accompanying it having been subsequently adopted by most ophiologists. In vol. cii. of the _Philosophical Transactions_ of 1812, p. 163, is a paper which was read before the Royal Society in February of that year, by Everard Home, Esq., F.R.S. It is entitled, ‘Observations to show that the Progressive Motion of Snakes is partly performed by the Ribs.’