TEGUMENTAHY ORGANS. 641 



and homogeneous, covered with sensitive papillae, traversed 

 by the piliferous follicles, the hairs, and the long tortuous 

 ducts of the sweat-glands (146. B. h.), and is in contact with 

 the rete mucosum (146. B. d.) of Malpighi, or the soft infe- 

 rior layer of epidermis. The prominent conical sensitive 

 papillae of the surface of the skin are most developed on the 

 naked palmar and plantar surfaces of the hands and feet in 

 the soft-footed animals, as seen on the palm of the human 

 hand (146. B. c.) ; and on many parts of the skin they are 

 not perceptible, as on the human scalp (146. A. a.). 



The sudoriferous glands have been detected by Gurlt in all 

 parts of the surface of the body, placed generally deeper than 

 the piliferous follicles, and imbedded in the subcutaneous 

 cellular substance. They are large and obvious to the naked 

 eye, beneath the soft skin of the genital region of the horse 

 (146. G. h.) 9 and nearly as large under the plantar surface of 

 the dog's foot, and they are of smaller size in other parts of 

 the hairy skin of the horse (146. F. e.), and in the skin of 

 the hog (146. C. b.). They are small and round in the palm 

 of the human hand (146. B. h.), more elongated in the human 

 scalp (146. A. d.) y minute, simple and uniform under the skin 

 of the ox (146. E, c.), and under the hairy skin of the dog, 

 and they are very large and equal under the thin soft skin of 

 the sheep (146. D.y. g.}. They consist each of a single 

 transparent long follicle, more or less convoluted into a mass 

 at its closed extremity, like the tubuli of the testis, and their 

 single tortuous duct, lined with epidermic cytoblasts or epi- 

 thelium, opens by a dilated conical orifice on the surface of 

 the skin (346. A. e. E. d.), or continues its spiral windings 

 (146. B. g.} through the strata of thickened cuticle (146. 

 B. a. b.). 



The small elongated racemose clusters of minute transpa- 

 rent white follicles, composing the conglomerate sebaceous 

 glands (146. A. h. C. e.), are situate more superficially in the 

 texture of the skin, than the piliferous follicles (146. A. 

 C././.) or tfie sudoriferous glands (146. A. d. C. .), which 

 extend more deeply into the subjacent cellular substance. 

 The sebaceous glands and the piliferous follicles occur over 

 most parts of the body, excepting on the naked palmar 

 and plantar surfaces of the hands and feet in man and car- 

 nivora, where neither are observed. In some naked parts of 



PART VII. T T 



