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To carry the art, however, to its highest pitch, it is necessary

that the reasoner should be able to utilise all the facts which

have come to his knowledge; and this in itself implies, as you

will readily see, a possession of all knowledge, which, even in

these days of free education and encyclopaedias, is a somewhat

rare accomplishment. It is not so impossible, however, that a man

should possess all knowledge which is likely to be useful to him

in his work, and this I have endeavoured in my case to do. If I

remember rightly, you on one occasion, in the early days of our

friendship, defined my limits in a very precise fashion."