212 



SPECIAL HISTOLOGY. 



than half through the cutis, which was 0*25'" thick. They 

 were entirely composed of round cells, perfectly similar to 

 those of the stratum Malpighii of the epidermis ; besides 

 which, each process had a delicate investment, which was 

 continuous with the boundary of the inner surface of the 

 epidermis. No trace of sweat-pores or ducts was visible. — 

 At the beginning of the sixth month, the glands in the sole of 

 the foot and palm of the hand extend as far as the middle and 

 inner fourth of the cutis, measure at the clavate extremity 

 0-028 — 0-04'" and 0*016 — 0-02 in the duct which arises from 

 them, are already slightly serpentine, and present a cavity, at 



all events partially, in their 

 narrow portion ; they do not, 

 however, penetrate the cuticle, 

 or in any way open on the 

 surface. It was not before 

 the seventh month that I per- 

 ceived, in the same situations, 

 the first indications of the 

 sweat-pores and ducts in the 

 epidermis, though as yet very 

 indistinct, and the latter form- 

 ing only half a spiral turn 

 (fig. 82, A) ; at the same time 

 the part of the gland which projected into 

 the corium was more considerably developed, 

 reached as far as the innermost portion of 

 that structure, and at its csecal extremity was 

 bent into a hook or even slightly convoluted, 

 so as to afford the first indication of a glan- 

 dular coil of about 0*04 to 0-06'". The canal 

 arising from it usually presented several marked undulations 

 and measured in total thickness 0*015 — , 022' / ', with a cavity 

 of 0*003 — , 004" / , which frequently extended even to the ter- 



..-e 



Fig. 82. A, rudiment of a sudoriparous gland from a seven-months' foetus, x 50. 

 The letters a, b, d, as in fig. 81. The cavity e is present throughout, only it does not 

 extend quite so far as the end of the thicker part of the rudiment of the gland, which 

 hecomes converted into the glandular coils. The continuation of the canals into the 

 epidermis and the sweat-pores,/, are present. B, a coil of a sudoriparous gland from 

 a fcetus at the eighth month. 



