341 



though sometimes scarcely discernible in their rudimentary condi- 

 tion, and retained apparently only in conformity to typical law. 



There is great difference in degree of development of the elements. 

 The secreting part of the liver is of large size compared to the ducts, 

 whilst that of the generative organ in the female, namel}^ the ovarium, 

 is comparatively minute. The appendage of the cervix is very large 

 in the biliferous apparatus, but scarcely discoverable in the stomach 

 and sigmoid flexure. The excretory duct in the digestive organ, 

 represented by a contraction across the middle of the stomach, is of 

 enormous length in the seminiferous gland, as the vas deferens. 



The popular terms being inexact or without meaning, it was 

 proposed to substitute for the ordinary names of the secreting 

 organs designations more aptly descriptive of their functions and 

 more in accordance with the principles of scientific nomenclature, as 

 follows : — 



The uriniferous gland. 



The seminiferous gland. 



The biliferous gland. 



The pneumatiferous gland. 



The intestinal gland. 



The ovuliferous gland. 



The lactiferous gland ; and 



The digestive gland. 

 The kidney, or uriniferous gland, presents an almost typical re- 

 gularity of development. The secreting element or cortical portion 

 is composed of small convoluted tubes covered with a net-work of 

 blood-vessels. 



The excretory duct or medullary structure arises from the cor- 

 tical part by numerous straight tubuli, which terminate in a duct 

 for the conveyance of the urine into 



The receptacle or bladder. This organ has a cervix lined with 

 mucous membrane in longitudinal folds, studded with minute fol- 

 licles and a rudimentary glandular appendage in the male. 



The efferent duct is constituted of the membranous portion of 

 the urethra. 



The seminiferous gland consists of the testicle, a collection of 

 convoluted tubercles, of an excretory duct called the vas deferens, 

 of a receptacle the analogue of the uterus, the vesiculse seminales 

 being the body, the prostate the glandular appendage surrounding 

 the cervix. The efferent duct is of considerable length ; the re- 

 reptacle is lined with an alveolar fissure like the gall-bladder and 

 some muscular fibres. 



The ovuliferous organ consists of the ovarium or secretory ele- 

 ment, the fallopian tubes or excretory duct, the uterus or recep- 

 tacle, the cervix and its glandular appendage in the shape of mucous 

 follices, and tlie vagina or efferent duct. The secretory structure is 

 not tubular, but vesicular ; the excretory duct is connected with the 

 ovarium by its fimbriated extremity at certain periods only, in con- 

 formity with its peculiar function. 



The lactiferous gland is remarkable for the singular distribution 



