120 OF PERSPIRATION. 



destruction, and reproduced more easily than any other 

 of the similar parts. 



178. It is completely sui generis, somewhat like a 

 horny lamella, and adheres to the subjacent corium by 

 the intervention of a mucus, and by numerous very 

 delicate fibrils which penetrate the latter.* 



The pores which Leuwenhoek imagined in it, do not 

 exist ; but it allows a very ready passage to caloric, car- 

 bon, hydrogen, and to matters immediately composed 

 of these, v. c. oil. 



179. The importance of the cuticle to organised sys- 

 tems, is demonstrated by its universality in the animal 

 and vegetable kingdoms, and by its being distinctly ob- 

 servable in the embryo from the third month at latest 

 after conception. 



180. The inner part of the cuticle is lined by a fine 

 mucous membrane, denominated from the opinion of its 

 discoverer, reticulum Malpighianum, and by means of 

 which chiefly the cuticle is united more firmly to the 

 corium. f ower 



Its nature is mucous, it is very soluble, and, being 

 thicker in Ethiopians, may be completely separated in 

 them from both the corium and cuticle, and made to 

 appear as a true distinct membrane.;}; (B) 



* W. Hunter, Med. Observations and hxpiiries. vol. ii. p. 52 sq. tab. i. 

 fie. 1, 2. The conjecture of this eminent man, — that the fibrils excrete the per- 

 spirable matter, is, 1 think, improbable. 



t Hence I have found the Epidermis of Albinos separate easily bv the beat 

 of the sun ; whereas in negroes, it scarcely does so on the application of a 

 blister. C. F. Mitchell, 1. c. p. 108. 



X B. S. Albinus, D* tcde if causa colnri* trthiopium et arteror. keminttui. 



Lupd. Btfcr. I :.;;. ito. Rg. i. 



Sum.Th. Socmnicrrinar, tier die kdrperl. Vertchiedcnk. rf« Xegen vom 

 fivropilrr. EtL 2. p. 46, sq, 



Sonic 



