As the day of examination approaches, the economy of our friend undergoes a complete transformation, but in an inverse entomological progression--changing from the butterfly into the chrysalis. He is seldom seen at the hospitals, dividing the whole of his time between the grinder and his lodgings; taking innumerable notes at one place, and endeavouring to decipher them at the other. Those who have called upon him at this trying period have found him in an old shooting-jacket and slippers, seated at a table, and surrounded by every book that was ever written upon every medical subject that was ever discussed, all of which he appears to be reading at once--with little pieces of paper strewn all over the room, covered with strange hieroglyphics and extraordinary diagrams of chemical decompositions. His brain is just as full of temporary information as a bad egg is of sulphuretted hydrogen; and it is a fortunate provision of nature that the _dura mater_ is of a tough fibrous texture--were it not for this safeguard, the whole mass would undoubtedly go off at once like a too tightly-rammed rocket. He is conscious of this himself, from the grinding information wherein he has been taught that the brain has three coverings, in the following order:--the _dura mater_, or Chesterfield overall; the _tunica arachnoidea_, or "dress coat of fine Saxony cloth;" and, in immediate contact, the _pia mater_, or five-and-sixpenny long cloth shirt with linen wristbands and fronts. This is a brilliant specimen of the helps to memory which the grinder affords, as splendid in its arrangement as the topographical methods of calling to mind the course of the large arteries, which define the abdominal aorta as Cheapside, its two common iliac branches, as Newgate-street and St. Paul's Churchyard, and the medio sacralis given off between them, as Paternoster-row.