...As for Prague, _veni, vidi, vici_. I went there with much trepidation to do my social-scientific duty. The mighty Hering in especial intimidated me beforehand; but having taken the plunge, the cutaneous glow and "euphoria" (_vide_ dictionary) succeeded, and I have rarely enjoyed a forty-eight hours better, in spite of the fact that the good and sharp-nosed Stumpf (whose book "Über die Raumvorstellungen" I verily believe thou art capable of never having noticed the cover of!) insisted on trotting me about, day and night, over the whole length and breadth of Prague, and that [Ernst] Mach (Professor of Physics), genius of all trades, simply took Stumpf's place to do the same. I heard [Ewald] Hering give a very poor physiology lecture and Mach a beautiful physical one. I presented them with my visiting card, saying that I was with their "Schriften sehr vertraut und wollte nicht eher Prague verlassen als bis ich wenigstens ein Paar Worte mit ihnen umtauschte," etc.[63] They received me with open arms. I had an hour and a half's talk with Hering, which cleared up some things for me. He asked me to come to his house that evening, but I gave an evasive reply, being fearful of boring him. Meanwhile Mach came to my hotel and I spent four hours walking and supping with him at his club, an unforgettable conversation. I don't think anyone ever gave me so strong an impression of pure intellectual genius. He apparently has read everything and thought about everything, and has an absolute simplicity of manner and winningness of smile when his face lights up, that are charming. With Stumpf I spent five hours on Monday evening (this is Thursday), three on Wednesday morning and four in the afternoon; so I feel rather intimate. A clear-headed and just-minded, though pale and anxious-looking man in poor health. He had another philosopher named Marty [?] to dine with me yesterday--jolly young fellow. My native _Geschwätzigkeit_[64] triumphed over even the difficulties of the German tongue; I careered over the field, taking the pitfalls and breastworks at full run, and was fairly astounded myself at coming in alive. I learned a good many things from them, both in the way of theory and fact, and shall probably keep up a correspondence with Stumpf. They are not so different from us as we think. Their greater thoroughness is largely the result of circumstances. I found that I had a more _cosmopolitan_ knowledge of modern philosophic literature than any of them, and shall on the whole feel much less intimidated by the thought of their like than hitherto.