Upon the subject he observes, "The soap of tartar, &c. operates powerfully upon the obstructions in the liver, which are the cause of the jaundice, and help to carry off the offending matter by urine. And as the term DIURETIC is oftener used than understood, I shall give the reader a short account of the operation of diuretics. Under the term diuretic may be comprehended all those medicines whose most remarkable properties appear in their increasing the discharge by urine, or which are supposed to have any power in removing obstructions of the urinary glands, or passages, from what cause soever, whether _humours_, _gravel_, or other offending matter. And in this view, diuretics come under these following kinds; to wit, they are either such as soften and lubricate the fibres composing the urinary glands and canals, by which they yield and relax into their due dimensions and capacities, of which kinds are all emollients already explained; or they are such as, by their attenuating and detersive properties, rarify and thin viscous or slimy humours, and adhere or carry them along the passages: or, again, they must be such as have a power of so altering the crafts or mixture of the humours, as to fit those to pass which could not get through before; and of this kind is the _soap of tartar_, as well as all the tribe of _lixivials_ and _fixed salts_." Gentle DEOBSTRUENTS, which additionally excite the secretion, and promote the discharge of urine, are known to act upon the _motion_ as well as the _property_ of the BLOOD, by stimulating the solids, and quickening their vibrations, thereby increasing the blood's velocity, and promoting its attenuation. Hence it is, those diuretics recommended by BRACKEN are peculiarly adapted to this, and such other disorders as originate in sluggish viscid habits, where the blood becomes too adhesive for regular circulation. He is of opinion, "That the JAUNDICE in HORSES mostly proceeds from a diminution or decay of the animal salts contained in the blood, and therefore the addition of such kind of salts must restore the creature to soundness of body." He also says, "he is fully persuaded that _Castile soap_, dissolved in white wine, or even in beer, will cure the disorder in its earliest stage; and that those who may be inclined to try it upon a HORSE in the _yellows_, may mix an ounce in two quarts of beer, and give it at four times, a pint a day, either _warm_ or _cold_, letting the horse have exercise; for the jaundice occasions a sluggish laziness in either man or beast, therefore exercise is proper to hinder the fluids from forming preternatural cohesions, which lay the foundation of the distemper."