Have any of our readers heard an introductory lecture on the Practice of Physic? Or have they ever looked through the preface of a medical book. In either case, the importance of the practitioner, considered as are topics which they must have found enlarged upon. The hero preserved for his country, the father for his family, the child for the parent, all are represented as having to thank the doctor. The sufferer, perhaps a delicate female, stretched on the bed of sickness, is described as hailing his approach as that of some ministering spirit, listening anxiously for his footstep, and hearing in the creaking of his shoes, (provided it be not too loud,) a sweet and soothing music. All this is as it ought to be. But let praise be awarded where it is due, and let us not, while we appreciate the claims of the doctor, be unmindful of those of the doctor's boy. His instrumentality in the restoration of health, at least among the higher orders, cannot be denied, any more than can that of the organ bellows-blower in the production of harmony. And yet, while the thundering rap of his master at the front door, falls so harmoniously on the ear, his gentle ring at the area, and the softly-whistled air with which he beguiles the time until it is answered, are no more regarded than the idle wind. He is observed speeding on his way to the abode of sickness, without interest, and loitering on it without indignation: he acquits himself, without admiration, of his high responsibilities; he violates them, and excites no horror. [Illustration: 068] Masters Scales and Potts are, respectively, the subordinate assistants of Mr. Graves and Mr. Slaymore. The latter of these gentlemen, with whom Master Potts is situated, dispenses health from a private surgery; the former from a more public establishment. The difference in point of grade between these two disciples of Galen is very plainly discernible even in their dependants, the two Children of the Mobility now before us. The uniform of Master Scales is much less aristocratic, and much less professional also, than that of Master Potts, who looks, particularly about the feet and legs, as if he had been intended by Nature for a licentiate of the Society of Apothecaries, rather than for the servant of one. Mr. Graves and Mr. Slaymore being two out of half-a-dozen medical men residing in the same street, their young auxiliaries are in the habit of coming frequently in contact, and dialogues of a characteristic nature often take place, on these occasions, between them. We hope the following colloquy may seem less in need of abbreviation to the reader than it might be to a patient dependent on its termination for his dose of calomel. "Hallo! old feller, where are you off to in sitch a hurry?" The querist was Master Scales, who in sauntering along the neighbouring square was passed by Master Potts, walking at a rapid pace, with his salutiferous burden upon his arm.