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MUNICH, February 14, 1829.

. . .But now I must talk to you of more important things, not of what I possess, but of what I am to be. Let me first recall one or two points touched upon before in our correspondence, which should now be fully discussed.

1st. You remember that when I first left Switzerland I promised you to win the title of Doctor in two years, and to be prepared (after having completed my studies in Paris) to pass my examination before the "Conseil de Sante," and begin practice.

2nd. You will not have forgotten either that you exacted this only that I might have a profession, and that you promised, should I be able to make my way in the career of letters and natural history, you would not oppose my wishes. I am indeed aware that in the latter case you see but one obstacle, that of absence from my country and separation from all who are dear to me. But you know me too well to think that I would voluntarily impose upon myself such an exile. Let us see whether we cannot resolve these difficulties to our mutual satisfaction, and consider what is the surest road to the end I have proposed to myself ever since I began my medical studies. Weigh all my reasons, for in this my peace of mind and my future happiness are concerned. Examine my conduct with reference to what I propose in every light, that of son and Vaudois citizen included, and I feel sure you will concur in my views.

Here is my aim and the means by which I propose to carry it out. I wish it may be said of Louis Agassiz that he was the first naturalist of his time, a good citizen, and a good son, beloved of those who knew him. I feel within myself the strength of a whole generation to work toward this end, and I will reach it if the means are not wanting. Let us see in what these means consist. [Here follows the summing up of his reasons for preferring a professorship of natural history to the practice of medicine, and his intention of trying for a diploma as Doctor of Philosophy in Germany.] But how obtain a professorship, you will say,—that is the important point? I answer, the first step is to make myself a European name, and for that I am on the right road. In the first place my work on the fishes of Brazil, just about to appear, will make me favorably known. I am sure it will be kindly received; for at the General Assembly of German naturalists and medical men last September, in Berlin, the part already finished and presented before the Assembly was praised in a manner for which I was quite unprepared. The professors also, to whom I was known, spoke of me there in very favorable terms.

In the second place there are now preparing two expeditions of natural history, one by M. de Humboldt, with whose reputation you are surely familiar,—the same who spent several years in exploring the equatorial regions of South America, in company with M. Bonpland. He has been for some years at Berlin, and is now about to start on a journey to the Ural Mountains, the Caucasus, and the confines of the Caspian Sea. Braun, Schimper, and I have been proposed to him as traveling companions by several of our professors; but the application may come too late, for M. de Humboldt decided upon this journey long ago, and has probably already chosen the naturalists who are to accompany him. How happy I should be to join this expedition to a country the climate of which is by no means unhealthy, under the direction of a man so generally esteemed, to whom the Emperor of Russia has promised help and an escort at all times and under all circumstances. The second expedition is to a country quite as salubrious, and which presents no dangers whatever for travelers,—South America. It will be under the direction of M. Ackermann, known as a distinguished agriculturist and as Councilor of State to the Grand Duke of Baden. I should prefer to go with Humboldt; but if I am too late, I feel very sure of being able to join the second expedition. So it depends, you see, only on your consent. This journey is to last two years, at the end of which time, happily at home once more, I can follow with all desirable facilities the career I have chosen. If there should be a place for me at Lausanne, which I should prefer to any other locality, I could devote my life to teaching my young countrymen, awaken in them the taste for science and observation so much neglected among us, and thus be more useful to my canton than I could be as a practitioner. These projects may not succeed; but in the present state of things all the probabilities are favorable. Therefore, I beg you to consider it seriously, to consult my uncle in Lausanne, and to write me at once what you think. . .

In spite of the earnest desire for travel shown in this letter it will be seen later how the restless aspirations of childhood, boyhood, and youth, which were, after all, only a latent love of research, crystallize into the concentrated purpose of the man who could remain for months shut up in his study, leaving his microscope only to eat and sleep,—a life as sedentary as ever was lived by a closet student.