570 F. A. E. CREW AND HONOR B. FELL 



stained with Mallory's stain they are affected by Orange G. 

 only, whatov(T the period of staining. A few display the blue 

 centre and bluish superficial film which we take to repre- 

 sent incipient calcification. Pairs of serial sections stained 

 alternately with Mallory's and Van Gieson's stains show that 

 those parts of a body which stain blue with Mallory's stain, stain 

 magenta or remain colourless with Van Gieson's stain. In many 

 of the tubules the bodies are surrounded by an aggregation of 

 cell material, but in others they lie free in the lumen. The 

 concentric structure characteristic of the bodies described in 

 the goat is most marked Init the number of rings is smaller 

 (PL 21, fig. 18). Indeed, in most cases only one ring is present 

 surrounding a more lightly-staining somewhat granular central 

 area. The primary ring is usually marked by secondary rings. 

 Sometimes two or more primary rings occur. 



Formation . — The method of formation of the intratubular 

 bodies appears to be the same as in the goat, viz. by the lique- 

 faction of aggregates of epithelial cells. This liquefaction may 

 take place round a degenerate epithelial imcleus, as described 

 above (PI. 20, fig, 12), or may proceed directly with the formation 

 of one or more colloid globules surrounded by a mass of desqua- 

 mated cells. The centre is formed by a degenerate nucleus, 

 the ovum-like appearance is very striking. As has already 

 been stated, calcification has begun in relatively few instances. 



Description of the Undescended Testis of 



a Cat. 



The testis was taken from a six months old animal and was 

 found at the external aperture of the inguinal canal. The 

 other testis had been removed from the scrotum a month 

 previously and there was then no sign of a second testis. The 

 cat was otherwise normal. 



A microscopical examination reveals arrested de^•elopment 

 and early degenerative changes. 



Seminiferous Tubules . — The seminiferous tubules are 

 of normal size and shape but show only the first stage of sperma- 



