I will now answer your inquiries for English Friends. Earl Derby remains much the same—very well in health, but deprived of the use of one side entirely, limbs as well as body—unable to attend to other things, he appears to devote himself almost entirely to Zoology—Thomson his Superintendent of the Aviary is at this time in London buying some new or rare pheasants lately arrived here from China—and will have a valuable addition to the stock to take back with him—Lord Derby came to London by the Rail Road last March (1840) and Thomson tells me, his Lordship means to come up again this Spring. The Prince of Musignano now P. of Canino I hear of by report from others—He is quite well, continually publishing, and we hear that he means to visit London in the course of the present year—of Mr. Lear we hear the most satisfactory accounts—generally through Mr. Hullmandill—he is greatly improved in health and finances—a favorite with every body, patronized by all who go there—and he too, we hear, means to visit England in the course of the present year. Mr. Gould returned safe to England in August last, after an absence of two years and 8 months—Two years of the time were passed on Van Diemans land and various parts of New Holland—he did not go to New Zealand—He has brought home a very large collection of Birds, with, in many cases, the eggs and nests—He has commenced the publication of the Birds on the same scale as his Birds of Europe, but improved in execution—two parts are out: it is to be published every three months. I sent off a letter this day to your Edinburgh friend Mr. MacGillivray—he is a candidate for the Professorship of Natural History in the Marischall College of Aberdeen and wrote to ask me for a testimonial of recommendation—this was the object of my letter to him.—My second volume of the British Birds will be complete in July next, I will send it to you in one lump. Pray remember me to your good lady and thank your son Victoire for me for his letter. I hope you are all well, and with best wishes for a continuance to you of all that is good—I remain very sincerely yours Wm. YARRELL. J. J. AUDUBON Esqr New York— Spencer Baird and his brother, William, were soon able to announce another discovery, now well known the country over as the Least Flycatcher, and in some sections by the onomatopœic name of Chebec. In referring to it in his letter of June 21, 1841, Baird wrote: