AC ARID A. 39 



position in the efferent duct of the gland, commonly"nearer to 

 the outlet of the duct than at the bottom, except when found in 

 corpses, The abdomen is usually directed towards the orifice and 

 the head towards the bottom of the gland ; rarely the reverse. 

 They continue to live for a considerable time in fatty oils, 

 \vhether they are taken from living or dead subjects. If the 

 animals be still, this is only a sort of apparent death, and they 

 again become lively by the application of a gentle heat. Even 

 the warmth diffused by a study lamp excites them to give renewed 

 signs of life. This is also probably the reason why it is so diffi- 

 cult to make permanent preparations of them. For in oily 

 media they at last creep entirely away under the varnish, &c. 

 In general their motions are sluggish. 



Therapeutics. According to Remak, the eruption improved by 

 a mixture of equal parts of spirits of camphor and oil of turpen- 

 tine ; but young mites were still found in four weeks, and in three 

 years the disease was as bad as ever. A popular remedy, a very 

 dear one certainly, is essential oil of cinnamon. The most ra- 

 tional thing would be to apply Durand's gall-stone mixture 

 (OL Terebinthina and Mth. Sulfur.} externally, after the sebaceous 

 matter has been squeezed out. 



Family of the true Itch-mites. ACARTDA. 



Animalia, mimina, caeca, mollia, non colorata, globiformia, aut in 

 cute animalium cuniculos agentes, et uti videtur vemnata, quorum 

 morsu pustulosum exanthema efflorescit, aut in materiis veyetabilibus 

 aut animalibus putrescentibus viventia. Pedibus 8,injuventute 6, 

 brevibus, difformibus, crassius articulatis, a chitinosa machina, ad 

 abdomen affixa, portatis et a linea mediana extrinsecus distantibus, 

 qui in articulo libero et extreme aut unguiculis aut aroliis in stylo 

 quodam affixis aut capillis mobilibus armati sunt ; rostello longo, 

 crasso, conico ; maxillis crassis, ex forficum forma ; palpis parvis 

 cum rostello coalitis. Species plerumque ovipar<B. Mares minor es 

 et tenuiores ; pedibus posterioribus usque aroliis armati. Femincs 

 mojores et crassiores, pedibus posterioribus interdum carentes. 



1. Acarus Scabiei. The Itch-mite. (Tab. IX, figs. 1 6. 



Synon. Sar copies Hominis sen Scabiei ; Cheyletes Scabiei. 

 Animalia cuniculos in cute humana agentia, setosa et spi- 



