What a plague it sometimes is to be hag-ridden by a tune, racing through one's head, with a never-ending always-beginningness, as though a thousand imps were singing it in one's ears. Wherever you may be, whomsoever with, whatsoever doing, still ring on those incessant tones of perchance the merriest of all jigs, till--it is Sunday morning, and you are preparing for church--you leave your house with the entire and miserable conviction, that, seated in your pew in the very face of the congregation-genteel sinners in silks, and satins, and feathers--you will betray your long-concealed suffering by giving vent to that interminable "Rory O'More," the moment you open your lips for the emission of "All people that on earth do dwell;" so ensuring your rapid transfer to the street, under the escort of the man with the parti-coloured coat and black wand, whose Sabbath duties of jerking the Sunday scholars, and rapping their heads with that authoritative cane, are unceremoniously interfered with on your behalf. Misery and disgrace stare you in the face, and all through an undue titillation of that part of your sensorium that takes cognisance of musical sounds; a titillation not to be subdued by endeavouring to direct your attention from it to the very gravest of all subjects; nor propitiated even by audibly chanting the offending strain, previously retiring into the furthest corner of your coal-cellar, to prevent your unwilling profanity on shocking the strictly conscientious ears of your household. This is bad--and yet it is but a mild form of this morbid affection, which, in its most intense degree, torments the sufferer from fever, (or one stunned by some sudden and violent grief,) when certain sounds, words, or tunes, accidentally determined, thrill through the head with the steadiness and vehement action of the piston of a steam-engine--beat, beat, beat!--every note seeming to fall on the excited brain like the blow of a hammer; while, as the fever and pain increase, the more rapidly and heavily do those torturing notes pursue their furious chase. We well remember, under an attack of disorder in the neighbourhood of the brain, causing severe suffering, lying--we know not how long, it might be a thousand years for any thing we knew--singing over and over again _in our mind_, for we were speechless with pain, the 148th psalm, which we had just chanced to hear sung, in Brady and Tate's version, to a new and somewhat peculiar tune. Oh, how those "dreadful whales" and "glittering scales" did quaver and quiver in our poor head! Lying like a log--for pain neither permitted us to stir nor groan--still rattled on, hard and quick, the rumbling bass and shrill tenor of that most inappropriately jubilant composition--"cherubim and seraphim," "fire, hail, and snow," succeeding each other with a railway velocity that there was no resisting; no sooner had we got to "stands ever fast," than round again we went to the "boundless realms of joy," and so on, on,