DISEASES OF THE SKIN. 173 



are to be removed by washing; if the hair is long it must be clipped, and 

 this applies to the greasy as well as to the other forms of eczema. When 

 the hair is removed and the parts thoroughly cleaned, a sufficiency of the 

 following may be applied, not only to the diseased, but to a good deal 

 of healthy skin; remembering that whatever the remedy be, much de- 

 pends upon its effectual application: 



Flowers of sulphur ^ viij. 



Carbonate of potassium § iv. 



Carbolic acid ^ i. 



Lard | xxxij. 



Olive oil 5 xxxij. 



This is to be left on the skin for two or three days, and then washed 

 off with soft soap and warm water. It acts as a cutaneous stimulant. 



The other remedies available in chronic eczema are lime water, bi- 

 chloride of mercury in weak solution, tar ointment, and mercurial oint- 

 ment. 



The following, which is only a form of the common purgative ball, is 

 highly recommended to be given twice a week during the continuance of 

 the disease, and even for a time after the necessity seems past: 



Powdered aloes 3 ij. 



Powdered resin , 3 iij. 



Powdered nitre 3 iij. 



Powdered ginger 3 ij. 



Castile soap 3 ij. 



Work up into one ball. 



PSORIASIS. 



Synonyms.— Mallenders ; Sallenders. 



Definition.— When this disease appears on the back of the hock, it 

 is called mallenders (Fig. 83); when upon the inside of the joint, sallen- 

 ders (Fig. 82). A chronic, non-contagious inflammation of the skin 

 occurring in patches and covered by epithelial scales. An intractable 

 disease. 



Etiology. — Psoriasis, as it first appears, resembles an eczematous 



