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pass the lacteals and other finer vessels, nor yet* perhaps, readily impart those virtues to a menstruum, that may with fasety and speed convey them throughout the human body. Upon all Which accounts, I believe tar-water will be found to have singular advantages. It is observed that acid spirits prove the stronger, by how much the greater degree of heat is required to raise them. And indeed, there seemeth to be no acid more gentle than this, obtained by the simple affusion of cold water; which carries off from the subject the most light and subtile parts, and, if one may sd speak, the very flower of it's specific qualities. And here it is to be noted, that the volatile falt and spirit of vegetables do, by gently stimulating the solids, attenuate the fluids contained in them, and promote secretions, and that they are penetrating and active, contrary to the general nature of other acids.

5|. It is a great maxim for health, that the juices of the body be kept fluid in a due proportion. Therefore, the acid volatile spirit in tar-water, at once attenuating and cooling in a moderate degree, must greatly conduce to health, as a mild falutary deobltruent, quickening the circulation of the fluids without wounding the solids, thereby gently removing or preventing those obstructions, which are the great and general cause of most chronical diseases; in this manner answering Co the antihysterics, assa fœtida, galbanum, myrrh, amber, and, in general, to all the resins and gums of trees or shrubs useful in nervous cases.

52. Warm water is it self a deobstruent. Therefore the insusion of tar drunk warm, is easier insinuated into all the nice capillary vessels, and acts, not only by virtue of the balfam, but also by that

D of oF the vhicle. It's taste, it's diuretic quality, to being so great a cordial, (hew the activity of this rstedi?ine. - And at the fame time that it quickens the sluggish bJood of the "hysterical, it's balfamic oily nature abates the too rapid motion of the sharp thin blood in those who are hectic. There is a Jen tour and smoothness in the blood of healthy ftrong people; on the contrary, there is often an acrimony and solution in that of weakly morbid persons. The fine particles of tar are not only warm and active, they are also balfamic and emollient, softening and enriching the sharp and vapid blood, and healing the erosions occasioned thereby Hi the blood-vessels and glands.

53. Tar-water possesseth the stomachic and cardiac qualities of Elixir proprietatis, Stoughton's drops, and many such tinctures and extracts, with this difference, that it worketh it's effect more sasely, as it hath nothing of that spirit of wine, which, however mixed and disguised, may yet be well accounted a poison in some degree.

54. Such medicines are supposed to be diaphoretic, which being of an active and subtile nature, pass through the whole system, and Work their effect in the finest capillaries and perspiratory ducts, which they gently cleanse and open. Tarwater is extremely well fitted to work by such an insensible diaphoresis, by the fineness and activity of it's acid volatile spirit. And surely those parts ought to be very sine, which can scour the perspiratory ducts, under the scarf skin or cuticle, if it be true that one grain of fand Would cover the mouths of more than a hundred thousand.

55. Another way wherein tar-water operates, is by urine, than which perhaps none is more si se and effectual, for cleansing the blood and carrying

off <*ff it's salts. But it seems to produce it's principal efsect as an alterative, sure and easy, much" saser than those vehement purgative, emetic, and' salivating medicines, which do violence to nature, 56. An obstruction of some vessels causeth the blood to move more swiftly in Other vessels, which are not obstructed. Hence manifold disorders. A iiquor that dilutes and attenuates resolves the con-; -cretions which obstruct. Tar-water is such a liquor. It may be faid, indeed, of common water, that it attenuates, also of mercurial preparations that they attenuate. But it should be considered that mere water only distends the vessels and thereby weakens their tone; and that .Mercury by it's great momentum may justly be suspected of hurting the fine capillaries, which two deobstruents therefore might easily overact their parts, and (by -lessening the force of the elastic vessels) remotely produce those concretions they are intended to remove.

57. Weak and rigid fibres are looked on by the most able physicians, as sources of two different classes of distempers : a sluggish motion of the liquids occasions weak fibres: therefore tar-water is good to strengthen them as it gently accelerates their contents. On the other hand, being an unctuous bland fluid it moistens and softens the dry and stiff fibres; and so proves a remedy for both extremes.

58. Common soaps are compositions of lixivial falt and oil. The corrosive acrimony of the faline particles, being softened by the mixture of an qnctuous substance they insinuate themselves into rhe small ducts with less disficulty and danger. The combination of these different substances makes up a very subtile and active medicine, fitted for mixing with all humours, and resolving $11 obstructions. Soap therefore is justly esteemed a most efficacious medicine in many distempers. Alcaline soap is allowed to be cleansing, attenuating, opening, resolving, sweetening; it is pectoral, Vulnerary, diuretic, and hath other good qualities which are also to be found in tar-water. It is granted, that oyl and acid falts combined together exist in vegetables, and that consequently there are acid soaps as well as alcaline. And the faponaceous nature of the acid vegetable spirits, is what renders them so diuretic, sudorific, penetrating, abstersive and resolving. Such, for instance, is the acid spirit of Guaiacum. And all these fame virtues seem to be in tar-water in a mild and falutary degree.

59. It is the general opinion that all acids coagulate the blood. Boerhaave excepts vinegar, which he holds to be a soap, inasmuch as it is found to contain an oyl as well as an acid spirit. Hence it is both unctuous and penetrating, a powersul antiphlogistic, and preservative against corruption and insection. Now it seems evident that tar-water is a soap as well as vinegar. For though it be the character of resin, which is an inspissated gross pyl, not to dissolve in water (a), yet the falts ar^ tract some fine particles of essential oyl: which fine pyl serves as a vehicle for the acid falts, and shews itself in the colour of the tar-water; for all pure falts are colourless. And though the resin will not dissolve in water, yet the subtile oyl, in which the vegetable falts are lodged, may as well mix with water as vinegar doth, which contains both oyl and falt. And as the oyl in tar-water discovers ('{self to the eye, so the acid falts do manisest

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themselves to the taste. Tar-water therefore is a soap, and as such hath the medicinal qualities of

soaps.

60. It operates more gently as the acid salts lose their acrimony being sheathed in oyl, - and thereby approaching the nature of neutral falts, are more benign and friendly to the animal system: and more effectually, as by the help of a volatile smooth insinuating oyl, those same falts are more easily introduced into the capillary ducts. Therefore in severs and epidemical diltempers it is (and I have found it so) as well as in chronical diseases, a most fase and efficacious medicine, being good against too great fluidity as a balfamic, and good against viscidity as a soap. There is something in the fiery corrosive nature of lixivial falts, which makes alcaline soap a dangerous remedy in all cases where an inflammation is apprehended. And as inflammations are often occasioned by obstructions, it should seem an acid soap was much the faser deobstruent. - 61. Even the best turpentines, however famous for their vulnerary and detergent qualities, have yet been observed by their warmth to dispose to inflammatory tumours. But the acid spirit (a) being

cooler and faser medicine. And the ætherial oyl of turpentine, though an admirable dryer, healer, and anodyne, when outwardly applyed to wounds and ulcers, and not less usesul in cleansing the urinary passages and healing their ulcerations, yet is known to be of a nature so very relaxing as sometimes to do much mischief. Tar-water is not attended with, the fame ill effects, which I believe are owing in a great measure to the ætherial oyls being deprived

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