AND PHARMACOPEIA. 469 



No. 2. Red precipitate (nitric oxide of 

 mercury, or red nitrated quick- 

 silver) finely powdered 1 oz. 



Burnt alum 2 drs. — Mix. 



No. 3. Crystallized verdigris (acetate of 



copper) finely powdered 1 oz. 



DETERGENT OINTMENTS. 



No. 1. Ointment of nitrated mercury. 



No. 2. Yellow basllicum (ointment of 



yellow resin) 2 ozs. 



jMelt, and add oil of turpentine .. 2 drs. 



Blue vitriol, finely powdered.... ^ oz. — Mix. 



DIACHYLON. Litharge, or lead plaster, is made by boil- 

 ing together olive oil nine parts, litharge five parts, water two 

 parts, over a slow fire, and constantly stirring, until the oil and 

 the litharge unite, and acquire the consistence of plaster. The 

 water is intended to prevent burning or discolouration of the 

 plaster, and must be replaced as it evaporates. Diachylon is an 

 ingredient in sticking plaster and charges, and is useful when 

 spread on leather for defending a tender part from pressure. 



DIACODIAN or DIACODIUM. A syrup made from a 

 decoction of the heads of white poppies, or more readily by dis- 

 solving the extract of white poppies in water, and forming it 

 into a syrup by the addition of a sufficient quantity of sugar. 



DIALTHEA. Marsh-mallow's ointment. An ointment 

 made from marsh-mallow's root, fenugreek seeds, palm oil, 

 linseed oil, and resin. Sometimes lard and turpentine are 

 added. 



DIAPHORETICS. Medicines that increase the natural 

 discharge by the skin ; which, when they act in so considerable 

 a degree as to occasion sweating, are termed sudoriftcs. 



It is extremely difficult to produce any visible effect upon the 

 horse's skin by means of medicine alone ; but when it is assisted 

 by proper exercise and warm clothing, we can generally give a 

 fine glossy appearance to the coat, though it is very difficult to 

 produce sensible perspiration, unless it be by violent exercise, 

 and immoderately warm clothing. The most effectual diapho- 

 retics in the horse, are medicines of the hot stimulating kind, 

 combined witli antimonial preparations and oj)ium : these, 

 however, cannot be employed with propriety in fevers, which 

 are generally an effect of internal inflammation ; they are useful 

 only when horses arc hide-bound, have a rough dry coat, and 

 appear in a state of debility. The effects of this class of mcdi- 



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