"Galen confirmed this discovery and he records a case (Lib. xi., p. 318) wherein there were exhibited in the intellectual bowels symptoms similar to those we find in appendicitis. The brain is wrought into certain convolutions, just as the alimentary canal is; the fourth layer, so called, contains elongated groups of small cells or nuclei, radiating at right angles to its plane, which groups present a distinctly fanlike structure. Catalogitis is a stoppage of this fourth layer, whereby the functions of the fanlike structure are suffered no longer to cool the brain, and whereby also continuity of thought is interrupted, just as continuity of digestion is prevented by stoppage of the vermiform appendix. "The learned Professor Biersteintrinken," continued Dr. O'Rell, "has advanced in his scholarly work on 'Raderinderkopf' the interesting theory that catalogitis is produced by the presence in the brain of a germ which has its origin in the cheap paper used by booksellers for catalogue purposes, and this theory seems to have the approval of M. Marie-Tonsard, the most famous of authorities on inebriety, in his celebrated classic entitled 'Un Trait sur Jacques-Jacques.'" "Did you effect a cure in the case of N. M.?" I asked. "With the greatest of ease," answered the doctor. "By means of hypnotism I purged his intellectuals of their hallucination, relieving them of their perception of objects which have no reality and ridding them of sensations which have no corresponding external cause. The patient made a rapid recovery, and, although three months have elapsed since his discharge, he has had no return of the disease." As a class booksellers do not encourage the reading of other booksellers' catalogues; this is, presumably, because they do not care to encourage buyers to buy of other sellers. My bookseller, who in all virtues of head and heart excels all other booksellers I ever met with, makes a scrupulous practice of destroying the catalogues that come to his shop, lest some stray copy may fall into the hands of a mousing book-lover and divert his attention to other hunting-grounds. It is indeed remarkable to what excess the catalogue habit will carry its victim; the author of "Will Shakespeare, a Comedy," has frequently confessed to me that it mattered not to him whether a catalogue was twenty years old--so long as it was a catalogue of books he found the keenest delight in its perusal; I have often heard Mr. Hamlin, the theatre manager, say that he preferred old catalogues to new, for the reason that the bargains to be met with in old catalogues expired long ago under the statute of limitations.