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416 writings. I have made also some little use of Grant's History (already quoted), of Wolf, and of Miss Clerke's System of the Stars.

Students are recommended to read any or all of the first four books named above; the Memoir gives a charming picture of Herschel's personal life and especially of his relations with his sister. There is also a good critical account of Herschel's work on sidereal astronomy in Proctor's Old and New Astronomy.

Chapter XIII.—Except in the articles dealing with gravitational astronomy I have constantly used Miss Clerke's History (already quoted), a book which students are strongly recommended to read; and in dealing with the first half of the century I have been helped a good deal by Grant's History. But for the most part the materials for the chapter have been drawn from a great number of sources—consisting very largely of the original writings of the astronomers referred to—which it would be difficult and hardly worth while to enumerate; for the lives of astronomers (especially of English ones), as well as for recent astronomical history generally, I have been much helped by the obituary notices and the reports on the progress of astronomy which appear annually in the Monthly Notices of the Royal Astronomical Society.

I add the names of a few books which deal with special parts of modern astronomy in a non-technical way:—