Dear Sir,—I tried the 6-1/4-inch mirror I had from you for the first time last night. The night was not a good one for definition, but I was very much pleased indeed with its performance.

Yours truly, C. H. W.

Honiton Rectory,

Dec. 23rd, 1874.

Dear Sir,—I have been wishing to tell you how pleased I am at the performance of your mirror. Many thanks for your kind offer to change the mirror if needful, but I think it could hardly be better than it is, its performance on different double stars is most excellent. I have examined nearly 100 of these since September with the 6-1/2-inch, most of them very difficult, but the mirror came out well under all tests. I send you a list of some of the objects I have examined.

Yours truly, H. Sadler.

π Aquilæ.—Divided, power 80. 14-m. Webb might have been rated 15-m. [6-m., 7-m. 1″·5.]

δ Aquilæ.—

ζ Persei.—My friend “Linea” sees two minute stars with 4·28-in. Wray, not in Webb, and Wray himself sees an excessively difficult companion. I see these 3 stars easily with 6-1/2-in. (Wray says his companion is “very difficult with 7-in. refractor, really only a glimpse star, even with the best atmosphere”), and have added two more stars to the group.

β Delphini.—Close double discovered by Burnham, est. 0″·7. In contact 6-1/2-in., power 430.

η Coronæ Borealis.—Very low, long past meridian, in contact 164 power.

β Equalei.—[a 5-1/2, b 13, c 14, b 16: a-b 35″, a-c 50″, b-B 3″.] 16-m. not seen, Webb 9-1/3-in. Just divided 164, easy 430 power. Two other companions (not seen by Smyth or Webb?)

μ Andromedæ.—The 16-m. comes, a very difficult test, easy; other comites (not seen by Smyth or Webb?) seen.

Companion to Vega pretty easy, Nov. 12th, 37m. after sunset.

P. 178 xx. Delphini.—[a 7-1/2, b 8, c 16, b 9: a-b 14″·3, b-b 0″·7, a-c 20″.] Smyth 16 by evanescent glimpses; easy 164 power, 6-1/2-in. 8-m. well elongated in direction of 230°, power 430.