Proceedings of the Association of American Anatomists VII 



a closed Malpighian corpuscle near the crest of the Wolffian ridge and 

 opening into the duct. The last of this set appears as though just cut 

 off from the coelomic epithelium. The remainder of the tubules do not 

 open into the duct. The first and the fourth to the seventh either open 

 by a clear funnel to the coelom or are continuous with the coelomic epi- 

 thelium near the crest of the ridge. The second, third and last of the 

 tubules are hollow like the rest but connect neither with the coelomic 

 epithelium nor with the duct. Wax reconstructions were made of the 

 entire Wolffian ridges and of individual tubules. The evidence is posi- 

 tive that there is a transitional condition lying between the two speci- 

 mens also belonging to the Mall collection described by MacCallum. In 

 one of these (15 days) there is a duct with thorn-like processes and no 

 coelomic funnels. In the other (21 days) all the tubules are of the 

 typical S-shape. A specimen of the Mall collection, of perhaps 17 days, 

 shows a condition approximating that of a kitten and shark which were 

 modeled and in which the tubules, although very simply curved, showed 

 the continuation from coelomic epithelium to the sub-spherical body and 

 from the latter to the Wolffian duct. Such a continuous tubule is not 

 realized in No. 148, a part of the tubules having lost connection with the 

 epithelium of the coelom, a part not having attained connection with the 

 duct. 



EPITHELIUM OF THE UTERUS AND FALLOPIAN TUBE IN MAMMALS. 

 By Simon Henry Gage. Department of Histology and EmJ)ryology, 

 Cornell University. 



A careful examination of text-books in anatomy and histology 

 brings out the fact that the statement is made in all of them that the 

 Fallopian tube or oviduct in mammals is lined throughout by a ciliated 

 epithelium. The statement is equally definite that the epithelium of 

 the entire uterus is also ciliated. Occasionally there are statements con- 

 cerning differences occurring in certain physiological conditions of the 

 uterus. Whenever anything is said concerning methods, as in Kolliker, 

 6th ed., vol. Ill, p. 581, it is stated that the cilia of these ciliated cells 

 are exceedingly difficult of preservation. The present investigation 

 shows: (1) That the oviduct in young mammals is lined by a simple 

 columnar epithelium which may be wholly non-ciliated or there may be a 

 limited number of ciliated cells on the fimbria next the ovary. (3) In 

 mature animals, as the bat and the mouse, the beginning of the oviduct, 

 that is the fimbriae of the pavilion and the folds of the ampulla may be 

 lined by ciliated epithelium, the rest of oviduct may be non-ciliated. In 

 human beings the oviduct, during maturity, appears to be lined through- 



