Exceptionally, the relief furnished by external treatment is more or less permanent. #Name the important antipruritic applications.# Alkaline baths; lotions of carbolic acid ([dram]j-[dram]iij to Oj), of resorcin ([dram]j-[dram]iv to Oj), of liquor carbonis detergens ([Oz]j-[Oz]iv to Oj), and liquor picis alkalinus ([dram]j-[dram]iv to Oj), used cautiously. One or several ounces of alcohol and one or two drachms of glycerin in each pint of these lotions will often be of advantage, as the following:-- [Rx] Ac. carbolici, ....................... [dram]j-[dram]iij Gylcerinae, ........................... f[dram]ij Alcoholis, ........................... f[oz]ij Aquae, ......... q.s. ad .............. Oj. M. Various dusting-powders, alone or in conjunction with the lotions. And in some cases, especially those in which the skin is unnaturally dry, ointments may be used, such as equal parts of lard, lanolin, and petrolatum, to the ounce of which may be added from five to thirty grains of carbolic acid, three to twenty grains of thymol, ten to thirty minims of chloroform, or two to ten grains of menthol. #What external applications are to be used in the local varieties of pruritus?# In _pruritus ani_ and _pruritus vulvae_, in addition to the various applications above, a cocaine ointment, one to ten grains to the ounce, a strong solution of the same (gr. v-xx to [Oz]j), and an ointment containing ten to thirty minims of the oil of peppermint to the ounce; sponging with hot water, often affords temporary relief. In pruritus vulvae, moreover, astringent applications and injections of zinc sulphate, alum, tannic or acetic acid, in the strength commonly employed for vaginal injections, are at times curative. In bath-pruritus weak glycerine lotions, and an ointment containing a few grains of thymol and menthol to the ounce sometimes give moderate relief. Turkish baths are sometimes free from subsequent pruritus. #CLASS VIII.--PARASITIC AFFECTIONS.# #Tinea Favosa.# (_Synonym:_ Favus.) #What is tinea favosa?# Tinea favosa, or favus, is a contagious vegetable-parasitic disease of the skin, characterized by pin-head to pea-sized, friable, umbilicated, cup-shaped yellow crusts, each usually perforated by a hair. #Upon what parts and at what age is favus observed?# It is usually met with upon the scalp, but it may occur upon any part of the integument. Occasionally the nails are invaded. It is seen at all ages, but is much more common in children. #Describe the symptoms of favus of the scalp.#