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111 content with the few chapters devoted to "Determinants" in works on Higher Algebra or the Theory of Equations, supplemented by references to Mr. Dodgson's work which can be found in the College libraries.

The general acceptance of the book would be rather restricted by the employment of new words and symbols, which, as the author himself felt, "are always a most unwelcome addition to a science already burdened with an enormous vocabulary." But the work itself is largely original, and its arrangement and style are, perhaps as attractive as the nature of the subject will allow. Such a book as this has little interest for the general reader, yet, amongst the leisured few who are able to read mathematics for their own sake, the treatise has found warm admirers.

In the Summer Vacation of 1867 he went for a tour on the Continent, accompanied by Dr. Liddon, whom I have already mentioned as having been one of his most intimate friends at this time. During the whole of this tour Mr. Dodgson kept a diary, more with the idea that it would help him afterwards to remember what he had seen than with any notion of publication. However, in later years it did occur to him that