It is with pleasure I hear GALEN reason concerning the structure of the human body. The anatomy of a man, says he [De formatione foetus], discovers above 600 different muscles; and whoever duly considers these, will find, that, in each of them, Nature must have adjusted at least ten different circumstances, in order to attain the end which she proposed; proper figure, just magnitude, right disposition of the several ends, upper and lower position of the whole, the due insertion of the several nerves, veins, and arteries: So that, in the muscles alone, above 6000 several views and intentions must have been formed and executed. The bones he calculates to be 284: The distinct purposes aimed at in the structure of each, above forty. What a prodigious display of artifice, even in these simple and homogeneous parts! But if we consider the skin, ligaments, vessels, glandules, humours, the several limbs and members of the body; how must our astonishment rise upon us, in proportion to the number and intricacy of the parts so artificially adjusted! The further we advance in these researches, we discover new scenes of art and wisdom: But descry still, at a distance, further scenes beyond our reach; in the fine internal structure of the parts, in the economy of the brain, in the fabric of the seminal vessels. All these artifices are repeated in every different species of animal, with wonderful variety, and with exact propriety, suited to the different intentions of Nature in framing each species. And if the infidelity of GALEN, even when these natural sciences were still imperfect, could not withstand such striking appearances, to what pitch of pertinacious obstinacy must a philosopher in this age have attained, who can now doubt of a Supreme Intelligence! Could I meet with one of this species (who, I thank God, are very rare), I would ask him: Supposing there were a God, who did not discover himself immediately to our senses, were it possible for him to give stronger proofs of his existence, than what appear on the whole face of Nature? What indeed could such a Divine Being do, but copy the present economy of things; render many of his artifices so plain, that no stupidity could mistake them; afford glimpses of still greater artifices, which demonstrate his prodigious superiority above our narrow apprehensions; and conceal altogether a great many from such imperfect creatures? Now, according to all rules of just reasoning, every fact must pass for undisputed, when it is supported by all the arguments which its nature admits of; even though these arguments be not, in themselves, very numerous or forcible: How much more, in the present case, where no human imagination can compute their number, and no understanding estimate their cogency!