others without much instructing myself, or in presiding at disputations in philosophy or theology, from which, after a certain time, I derived little intellectual improvement. Whilst I was an under-graduate, I kept a great deal _of what is called_ the best company--that is, of idle fellow-commoners, and other persons of fortune--but their manners never subdued my prudence; I had strong ambition to be distinguished, and was sensible that wealth might plead some excuse for idleness, extravagance and folly in others; the want of wealth could plead more for me. When I used to be returning to my room at one or two in the morning, after spending a jolly evening, I often observed a light in the chamber of one of the same standing with myself; this never failed to excite my jealousy, and the next day was always a day of hard study. I have gone without my dinner a hundred times on such occasions. I thought I never entirely understood a proposition in any part of mathematics or natural philosophy, till I was able, in a solitary walk, _obstipo capite atque ex porrecto labello_, to draw the scheme in my head, and go through every step of the demonstration without book, or pen and paper. I found this was a very difficult task, especially in some of the perplexed schemes and long demonstrations of the twelfth Book of _Euclid_, and in _L'Hôpital's_ Conic Sections, and in _Newton's_ Principia. My walks for this purpose were so frequent, that my tutor, not knowing what I was about, once reproved me for being a lounger. I never gave up a difficult point in a demonstration till I had made it out _proprio marte_; I have been stopped at a single step for three days. This perseverance in accomplishing whatever I undertook, was, during the whole of my active life, a striking feature in my character. But though I stuck close to abstract studies, I did not neglect other things; I every week imposed upon myself a task of composing a theme or declamation in Latin or English. I generally studied mathematics in the morning, and classics in the afternoon; and used to get by heart such parts of orations, either in Latin or Greek, as particularly pleased me. Demosthenes was the orator, Tacitus the historian, and Persius the satirist whom I most admired. I have mentioned this mode of study, not as thinking there was any thing extraordinary in it, since there were many under-graduates then, and have always been many in the University of Cambridge, and, for aught I know, in Oxford, too, who have taken greater pains. But I mention it because I feel a complacence in the recollections of days long since happily spent, _hoc est vivere bis vita posse priori frui_, and indulge in a hope, that the perusal of what I have written may chance to drive away the spirit of indolence and dissipation from young men; especially from those who enter the world with slender means, as I did. In January, 1759, I took my Bachelor of Arts' degree. The taking of this first