_Pulv. anisi verum_ will be much more easily reduced from the cakes, after the seed has been expressed, the oil obtained, and their medical virtue entirely extracted; it is an article only in use for horses and cows; whether they are _killed or cured_, is an object not worthy your consideration. _Liquorice_, _fenugreek_, _diapente_, _turmeric_, and _elecampane_, are to receive their basis from _horse beans_ ground (at the medical mills) exceedingly fine, and to be impregnated properly with the different articles from which they derive their names, so as to retain each their predominant effluvia; and as these are articles in use for cattle only, you will give proof of your humanity, by drenching them with _food_ instead of _physic_. The species _hiera_ will be much more certain in its effects, if prepared with the _Barbadoes_, instead of the _Succotrine_ aloes; and the true Dutch biscuit powder, will form no unprofitable union with the powder of _Salop_. In fact, innumerable instances of professional skill and œconomy might be introduced, extending instructions to a much greater length than originally intended; protracting the explanatory parts beyond the limits of utility, an accusation it has been my principal care to avoid. It may perhaps be almost unnecessary to remind you, how absolutely needful it will be, to reduce to impalpable pulverization and complicated forms, all inferior and damaged _drugs_ of every denomination; in _powders_, _tinctures_, _electuaries_, and other preparations, their defects will not be perceptible, and it will prove matter of no small gratification to you, that many practitioners are very _inferior judges_ of the compositions they constantly prescribe; to these may be added the still greater number, that never condescend to undergo the task of inspection, forming together a major part of the very numerous and respectable body I have undertaken to instruct.—If you are a dispenser of _chemicals_ and _galenicals_ by retail, one additional observation will prove worthy your attention—never let your shop, or dispensary, get into disrepute by too much modesty, in saying you are without the most obsolete or ridiculous article that can be enquired for; if _oil of swallows_, _oil of bricks_, _lobsters’ blood_, or _milk of lilies_, should be the objects in request, let the fertility of your invention _instantly_ furnish a substitute for either; of these, such a great variety are always to be found, the least enumeration becomes unnecessary. The series of instructions advanced for the promotion of professional interest, have been promulgated without a fear of offence, or hope of reward; amidst the very great number of different practitioners, into whose hands these admonitions must inevitably fall, happy he who can exultingly exclaim, “Let the gall’d jade wince, our withers are unwrung.”