.LAK il. i. 5. n. OF SENSATION. 259 



M. M. Cover the eruption daily with ink. With white mer- 

 cmial ointment, asdeicribed above in herpes. "With foiution of 



lie vitriol ten grains to an ounce. Thefe metallic calces .dim- 

 ul.ire the abforbents into ftronger action, wlience the fluid lias 

 its faline part reabforbed, and that before it has acceis to the air, 

 which probably adds to its acrimony by oxygenating it and thus 

 producing a new acid. 



1 1. Tinea. Scald head. This contagious eruption affefts 

 the roots of the hair, and is generally mod virulent round the 

 edges of the hair on the back part of the head ; as the corona 

 veneris appears moft on the edges of the hair on the fore part of 

 the head : for in thefe parts the eruption about the roots of the 

 hair is mod expofed to the external air, by which its acrimony 

 or noxious quality is increafed. 



The abforption of the matter thus oxygenated fwells the lymph- 

 atics of the neck by its ftimulus, occafioning many little hard 

 Jumps beneath the feat of the eruption ; when this happens, the 

 fooner it is cured the better, left the larger lymphatic's of the 

 neck (hould become affected. 



M. M. The art of curing thefe eruptions confifls, fifft, in 

 abating the inflammation, and confequent fecretion of a noxious 

 material. Secondly, in preventing its accefs to the air, which fo 

 much increafes its acrimony. And thirdly, in promoting the ab- 

 forption of it, before it has been expofed to the air. For thefe 

 purpofes venefeclion once, and gentle cathartics, which promote 

 abforption by emptying the blood-veffels. Next poultices and 

 fomentations, with warm water, abate inflammation by diluting 

 the faline acrimony of the fecreted fluid, and abating the painful 

 fenfation. Afterwards cerate joined with fome metallic calx, as 

 of zinc or lead, or foiution of lead, mercury, or copper, or iron, 

 which may ftimulate the abforbent fyftem into ftronger action. 



Cover the fhaved head with tar and fuet, and a bladder ; this, 

 by keeping the air from the fecreted fluid, much contributes to 

 its mildnefs, and the ftimulus of the tar increafes its abforption. 

 See the three preceding fpecies of this genus. 



Mr. Morifon of Dublin cures the tinea capitis'by what he terms 

 an adhefive pafte, which is made by boiling half a pound of fine 

 flour in two pounds of common ale, and then adding four ounces 

 of yellow refin in fine powder, and {lining them well together, 

 until they are perfectly incorporated. After removing the hair, 

 and poulticing the head for a day or two, to take off the hard 

 fcabs, this patte is fpread on flips of linen, which are applied 

 over the whole affected part, and removed and frefh ones appli- 

 ed every morning, after one or two days, I fufpecl, that re- 

 moving the platters feldomer might be more advantageous. 



12. Cru/la 



