Went to Crystal Palace; admired the houses on Fifth Avenue . . . Saw [Horace] Greeley; Snow, the commercial editor of the Tribune; Solon Robertson; Fry, the musical critic, etc.; and others. Greeley carried me to the new opera-house, where I heard Grisi and her troupe . . . Greeley appeared to know and to be known by everybody; was admitted free to the opera, and we were led by a page to various parts of the house at different times. Saw at Museum some large flakes of cutting arrowhead stone made into a sort of wide cleavers, also a hollow stone tube, probably from mounds.