Along with all this mental perturbation, symptoms of scurvy, a disease now almost unknown among landsmen, but which, in the days of winter salt meat, before root crops flourished in the Lothians, greatly plagued our forefathers, made their appearance. And, indeed, it may be suspected that physical conditions were, at first, at the bottom of the whole business; for, in 1731, a ravenous appetite set in and, in six weeks from being tall, lean, and raw-boned, Hume says he became sturdy and robust, with a ruddy complexion and a cheerful countenance—eating, sleeping, and feeling well, except that the capacity for intense mental application seemed to be gone. He, therefore, determined to seek out a more active life; and, though he could not and would not "quit his pretensions to learning, but with his last breath," he resolved "to lay them aside for some time, in order the more effectually to resume them."
The careers open to a poor Scottish gentleman in those days were very few; and, as Hume's option lay between a travelling tutorship and a stool in a merchant's office, he chose the latter.
"And having got recommendation to a considerable trader in Bristol, I am just now hastening thither, with a resolution to forget myself, and everything that is past, to engage myself, as far as is possible, in that course of life, and to toss about the world from one pole to the other, till I leave this distemper behind me."[3]
But it was all of no use—Nature would have her way—and in the middle of 1736, David Hume, aged twenty-three, without a profession or any assured means of earning a guinea; and having doubtless, by his apparent vacillation, but real tenacity of purpose, once more earned the title of "wake-minded" at home; betook himself to a foreign country.
"I went over to France, with a view of prosecuting my studies in a country retreat: and there I laid that plan of life which I have steadily and successfully pursued. I resolved to make a very rigid frugality supply my deficiency of fortune, to maintain unimpaired my independency, and to regard every object as contemptible except the improvement of my talents in literature."[4]
Hume passed through Paris on his way to Rheims, where he resided for some time; though the greater part of his three years' stay was spent at La Flêche, in frequent intercourse with the Jesuits of the famous college in which Descartes was educated. Here he composed his first work, the Treatise of Human Nature; though it would appear from the following passage in the letter to Cheyne, that he had been accumulating materials to that end for some years before he left Scotland.
"I found that the moral philosophy transmitted to us by antiquity laboured under the same inconvenience that has been found in their natural philosophy, of being entirely hypothetical, and depending more upon invention than experience: every one consulted his fancy in erecting schemes of virtue and happiness, without regarding human nature, upon which every moral conclusion must depend."
This is the key-note of the Treatise; of which Hume himself says apologetically, in one of his letters, that it was planned before he was twenty-one and composed before he had reached the age of twenty-five.[5]
Under these circumstances, it is probably the most remarkable philosophical work, both intrinsically and in its effects upon the course of thought, that has ever been written. Berkeley, indeed, published the Essay Towards a New Theory of Vision, the Treatise Concerning the Principles of Human Knowledge, and the Three Dialogues, between the ages of twenty-four and twenty-eight; and thus comes very near to Hume, both in precocity and in influence; but his investigations are more limited in their scope than those of his Scottish contemporary.
The first and second volumes of the Treatise, containing Book I., "Of the Understanding," and Book II., "Of the Passions," were published in January, 1739.[6] The publisher gave fifty pounds for the copyright; which is probably more than an unknown writer of twenty-seven years of age would get for a similar work, at the present time. But, in other respects, its success fell far short of Hume's expectations. In a letter dated the 1st of June, 1739, he writes,—