. . .Since my arrival I have seen so much that I hardly know where to begin my narrative, and what I have seen has suggested reflections on many grave subjects, of a kind I had hardly expected to make here. Nowhere have I seen establishments on broader or more stately foundations, nor do I believe that anywhere are foreigners allowed more liberal use of like institutions. I speak of the university, the hospitals, libraries, and collections of all sorts. Neither have I seen anywhere else such fine churches, and I have more than once felt the difference between worshiping within bare walls, and in buildings more worthy of devotional purposes. In one word, I should be enchanted with my stay in Vienna if I could be free from the idea that I am always surrounded by an imperceptible net, ready to close upon me at the slightest signal. With this exception, the only discomfort to a foreigner here, if he is unaccustomed to it, is that of being obliged to abstain from all criticism of affairs in public places; still more must he avoid commenting upon persons. I am especially satisfied with my visit from a scientific point of view. I have learned, and am still learning, the care of the eyes and how to operate upon them; as to medicine, the physicians, however good, do not surpass those I have already known; and as I do not believe it important that a young physician should familiarize himself with a great variety of curative methods, I try to observe carefully the patient and his disease rather than to remember the medicaments applied in special cases. Surgery and midwifery are poorly provided, but one has a chance to see many interesting cases. During the last fortnight I have visited the collection of natural history often, generally in the afternoon. To tell you how I have been expected there from the moment I was known to be here, and how I was received on my first visit, and have been feted since (as Ichthyologus primus seculi,--so they say), would, perhaps, tire you and might seem egotistical in me, neither of which do I desire. But it will not be indifferent to you to know that Cotta is disposed to accept my Fishes. He has been at Munich for some days, and Schimper has been talking with him, and has advanced matters more by a few words than I had been able to do by much writing. For this reason I intend returning soon to Munich to complete the business, since Cotta is to be there several weeks longer. Thus I shall have reached my aim, and be provided from this autumn onward with an independent maintenance. I was often very anxious this past winter, in my uncertainty about the means of finally making good such large outlays. If, however, Cotta makes no other condition than that of a certain number of subscribers, I shall be sure of them in six months. You may thus regard what I have done as a speculation happily concluded, and one which places me at the summit of my desires, for it leaves me free, at last, to work upon my projects. . .