There were two variations of this dream of adventure--one involving a snow-house, with appropriate episodes such as nocturnal attacks by bears, wolves, and the like, and then we planned a sea voyage. I rebelled a long time at the notion that my life must be like that of everybody else, but I had no recourse in the end but to capitulate. IX AS A STUDENT I was never more than commonplace as a student, inclining rather to be bad than good. I had no great liking for study, and, to tell the truth, I never entertained any clear idea of what I was studying. For example, I never knew what the word preterite meant until years after completing my course, although I had repeated over and over again that the preterite, or past perfect, was thus, while the imperfect was thus, without having any conception that the word preterite meant past--that it was a past that was entirely past in the former case, and a past that was past to a less degree in the latter. To complete two years of Latin grammar, two of French, and one of German without having any conception of what preterite meant, demonstrated one of two things: either my stupidity was very great, or the system of instruction deplorable. Naturally, I incline toward the second alternative. While preparing to take my degree in medicine, when I was studying chemical analysis, I heard a student, who was already a practising physician, state that zinc was an element which contained a great deal of hydrogen. When the professor attempted to extricate him from his difficulty, it became apparent that the future doctor had no idea of what an element was. My classmate, who doubtless entertained as little liking for chemistry as I did for grammar, had not been able throughout his entire course to grasp the definition of an element, as I had never been able to comprehend what a preterite might be. For my part--and I believe that all of us have had the same experience--I have never been successful in mastering those subjects which have not interested me. Doubtless, also, my mental development has been slow. As for memory, I have always possessed very little. And liking for study, none whatever. Sacred history, or any other history, Latin, French, rhetoric and natural history have interested me not at all. The only subjects for which I cared somewhat, were geometry and physics. My college course left me with two or three ideas in my head, whereupon I applied myself to making ready for my professional career, as one swallows a bitter dose. In my novel, _The Tree of Knowledge_, I have drawn a picture of myself, in which the psychological features remain unchanged, although I have altered the hero's environment, as well as his family relations, together with a number of details. Besides the defects with which I have endowed my hero in this book, I was cursed with an instinctive slothfulness and sluggishness which were not to be denied.