i3° 



SUDORIPAROUS GLANDS. 



[sect. 71. 



parous glands first appear in the fifth month of embryonic life; 

 they are, originally, nothing hut completely solid, someichat flask- 

 shaped processes of the mucous layer of the epidermis, and very 

 much resemble the first rudiments of the hair-follicles. In the 

 earliest conditions which I have observed, the processes measured 

 in the sole of the foot 0-03"' to o'oo/" in length, 001'" in breadth 



at the neck, and croiS'" to 



ess 



; 



Fig 57. 



A. 



f 



d— 



o'oi!" at the bottom. Even the 

 longest did not extend half-way 

 through the cutis, which was 

 0'25"' thick. They consisted, 

 throughout, of round cells, quite 

 resembling those of the mucous 

 layer. Each outgrowth had, in 

 addition, a delicate envelope, 

 which extended to the boundary 

 line of the inner surface of the 

 epidermis. I could find no trace 

 of sweat-pores or sweat- ducts. 

 At the commencement of the 

 sixth month the glands of the 

 palm of the hand and sole of the 

 foot extend to the middle and 

 lower fourth of the cutis; they 

 measure o'028'" to o"04"' at their 

 swollen Cud, o'oi6'" to o , 02 / " 



A. Sudoriparous gland-rudiments from a seven -, , ■. -, , -, n 



months' foetus, 50 times magnified, o. Horny layer where the ClUct aSCeUQS Irom 



of the epidermis, b. Mucous layer, c. Corium. ,, -, ,, -, j v 1 ±1 



The cavity e is fully formed, except that it does not the latter are already Slightly 



quite reach the thick extremity, which becomes ,.  t , , i , 



tr.insformed into a glandular coii. The continua- serpentine, and present, at least 



tions of the ducts into the epidermis; and the ., , •, 



sweat-pores, /., are present. B. A coil of a sudo- 111 their liaiTOWei* part, a Cavity, 

 riparous gland from a foetus of eight months. -,-, i „, ,;• „, 



without, however, penetrating 

 into the epidermis, or opening upon its outer surface. It was 

 not till the seventh month that I found, on the same parts of 

 the body, and then but very indistinctly, the first traces of 

 the sweat-pores and sweat-canals in the epidermis, the latter 

 forming only half a spiral turn. On the other hand, the part 

 of the gland lodged in the cutis was more considerably de- 

 veloped, reached as far as the innermost part of the latter, and 

 was curved like a hook, or already somewhat coiled up at its blind 

 extremity, so as to present the first indication of a glandular coil 

 of about o - 04'" to o"o6 w in diameter. The canal arising from it 

 generally made several well-marked spiral turns, and presented a 



