Page:Carroll - Sylvie and Bruno.djvu/50

22 much written Science that no living person has ever read: and there is so much thought-out Science that hasn't yet been written. But, if you mean the whole human race, then I think the minds have it: everything, recorded in books, must have once been in some mind, you know."

"Isn't that rather like one of the Rules in Algebra?" my Lady enquired. ("Algebra too! I thought with increasing wonder.) "I mean, if we consider thoughts as factors may we not say that the Least Common Multiple of all the minds contains that of all the books; but not the other way?"

"Certainly we may!" I replied, delighted with the illustration. "And what a grand thing it would be," I went on dreamily, thinking aloud rather than talking, "if we could only apply that Rule to books! You know, in finding the Least Common Multiple, we strike out a quantity wherever it occurs, except in the term where it is raised to its highest power.  So we should have to erase every recorded thought, except in the sentence where it is expressed with the greatest intensity."