In 1825 I became a boarder in his family, where I remained about a year. Here I had an opportunity to consult and even study the various standard authors in the several departments which are usually regarded as belonging to a course of medical study. So that if I was not in due time properly qualified to "practise medicine and surgery in this or any other country," the fault was chiefly my own. However, in the spring of 1825, after I had attended a five months' course of lectures in one of the most famous medical colleges of the Northern States, I was regularly examined and duly licensed. _How_ well qualified I was supposed to be, did not exactly appear. It was marvellous that I succeeded at all, for I had labored much on the farm during the three years, taught school every winter and two summers, had two or three seasons of sickness, besides a severe attack of influenza (this, you know, is not regarded as a disease by many) while attending lectures, which confined me a week or more. And yet one of my fellow students, who was present at the examination, laughed at my studied accuracy! One word about my thesis, or dissertation. It was customary at the college where I heard lectures--as it probably is at all others of the kind--to require each candidate for medical license to read before the board, prior to his examination, an original dissertation on some topic connected with his professional studies. The topic I selected was pulmonary consumption; especially, the means of preventing it. It was, as may be conjectured, a slight departure from the ordinary routine, but was characteristic of the writer's mind, prevention being then, as it still is, and probably always will be, with him a favorite idea. I go so far, even, as to insist that it should be the favorite idea of every medical man, from the beginning to the end of his career. "The best part of the medical art is the art of avoiding pain," was the motto for many years of the _Boston Medical Intelligencer_; and it embraced a most important truth. When will it be fully and practically received? But I must recapitulate a little; or rather, I must go back and give the reader a few chapters of incidents which occurred while I was a student under Dr. W., my second and principal teacher. I will however study brevity as much as possible. CHAPTER XV. NATURE'S OWN EYE WATER. When I began the study of medicine, my eyes were so exceedingly weak, and had been for about ten years, or indeed always after the attack of measles, that I was in the habit of shading them, much of the time, with green or blue glasses. My friends, many of them, strongly objected to any attempt to pursue the study of medicine on this very account. And the attempt was, I confess, rather hazardous.