REPRODUCTION IX THE DOMESTIC FOWL. 279 



cells but these were irregular and had lost their epithelial char- 

 acter. In some of the tubes were eosin-staining non-cellular 

 masses like those found in the left genital gland. In the right 

 gland we did not find cells surrounding these masses. 



On the dorsal side of the organ was a mass of tubules. Those 

 seen in each section varied considerably in diameter but they 

 were much smaller toward the cranial end of the organ. This 



o 



mass of tubules extended the full length of the testis. The 

 tubes were lined with simple, heavily ciliated, columnar epi- 

 thelium. Outside this, especially in the larger tubules, could 

 be distinguished one or more layers of smooth circular muscle 

 cells. The tubes were imbedded in connective tissue. This 

 tubular structure was in all essential particulars precisely like a 

 normal epididymis and without any question represents that organ. 

 A photograph of a section through the epididymis is shown in 

 Plate II., Fig. 2. The magnification used in this figure is low, 

 but on the original negative the cilia on the cells lining the tubes 

 can be plainly seen. 



On the median side of the testis and lying for the most part at 

 the side of the epididymis, though in some portions extending 

 between the gland and the epididymis, was a mass of very vascu- 

 lar connective tissue. 



Sections of the vas deferens at about the middle of its length 

 showed it to be a tube considerably larger in diameter than the 

 largest part of the epididymis. It was lined with columnar 

 epithelium showing, in some sections, two rows of nuclei close 

 together. In some sections cilia could be distinguished, but they 

 were not so easily demonstrated as in the epididymis. There 

 was a subepithelial layer of non-muscular tissue, probably the 

 mucosa, and outside this a thick layer containing smooth muscle 

 fibers. We were unable to distinguish different muscular layers 

 in our sections. 



The lumen of the vas deferens and also parts of the epididymis 

 contained masses which stained strongly with eosin. These 

 masses included irregular fragments that took the chromatin stain. 



In general, the histological study of the right genital gland led 

 to the same conclusion as did that of the left, namely, that we were 

 dealing with a degenerating structure. As is indicated in the 



