Nevertheless, though men of abilities have not thought seamen worth their pen, others have; but such whose pursuit in life has been stimulated by motives of a different cast. Those have furnished seamen not only with directions to cure _all_ diseases, but even given them medicines to do it with, into the bargain; or to speak more seriously, given them directions how to use such medicines as would yield the most profit to the apothecary, who with pretended wisdom equipt them out: and I am apt to think, that kind of quackery has stolen away the lives of many valuable seamen. It is universally asserted that seamen are not fond of reading; this in a great measure is true, but far from being a general rule; and though blind prejudice has given them an aversion to every thing _physical_, yet I will venture to say so much in their behalf, that hitherto nothing has been offered to them that could alter their opinion in this respect, or open their eyes, in shewing them the beauties of that useful study, and in how small a compass its true principles might be contained. Physic like religion is rendered intricate and abstruse, the more it abounds in errors and absurdities; but truth like the brilliant sun, drives away all the phantoms of perplext mysteries, and proves that both alike are simple and beautiful, founded on reason, and that its most useful part is comprehensive to common understanding. This pleads in favour of my attempt, and with every man of sense, must overpower prejudice. That I might the better succeed in my intention, I have begun the whole at the first principles, namely the mechanism of the human body; for I cannot see how any man can pretend to know the nature of diseases, or presume to administer any thing with certainty, without he has some knowledge of the parts that suffer: this then is the subject of my first lecture; and to make it the more pleasing, and to entice the reader to pursue, I have stript it of every thing pedantic, or the unnecessary perplexing particulars, and confined myself to such things only, as gives a concise and true idea of the whole animal system; and if I may be allowed to judge from the opinion of some of my learned friends, I flatter myself, that my readers, physical or not, will give me their sanction, as well with respect to plainness of language, as conciseness of the subject, and the utility of such a short dissertation, founded on experience, and stript of prejudice and errors. The second lecture contains equally as copious a subject as the first; contracted in a very small compass, and which I hope will give as much satisfaction as the forementioned.