594 THE STRUCTURE AND DEVELOPMENT 



Waldeyer 1 notices this tissue in the dog, cat, and calf. The 

 following is a free translation of what he says, (p. 141) : 

 " In a full grown but young dog, with numerous ripe follicles, 

 there were present in the vascular zone of the ovary numerous 

 branched elongated small columns (Schlauche) of epithelial cells, 

 between which ran blood-vessels. They were only separated 

 from the egg columns of the cortical layer by a row of large 

 follicles. There can be no doubt that we have here remains 

 of the sexual part of the Wolffian body the canals of the 

 parovarium which in the female sex have developed themselves 

 to an extraordinary extent into the stroma of the sexual gland, 

 and perhaps are even to be regarded as homolognes of the 

 seminiferous tubules (the italics are my own). I have almost 

 always found the above condition in the dog, only in old animals 

 these seminiferous canals seem gradually to atrophy. Similar 

 columns are present in the cat, only they do not appear to grow 

 so far into the stroma." Identical structures are also described 

 in the calf. 



Romiti gives a very similar description to Waldeyer of these 

 bodies in the dog 2 . Born also describes this tissue in young 

 and embryonic ovaries of the horse as the Keimlager*. The 

 columns described by Kolliker 4 and believed by him to furnish 

 the follicular epithelium, are undoubtedly my tubuliferous tissue, 

 and, as Kolliker himself points out, are formed of the same 

 tissue as that described by Waldeyer. 



Egli gives a very clear and accurate description of this 

 tissue, though he apparently denies its relation with the Wolffian 

 body. 



My own interpretation of the tissue accords with that of 

 Waldeyer. In addition to the rabbit, I have observed it in the 

 dog, cat, and sheep. In all these forms I find that close to the 

 attachment of the ovary, and sometimes well within it, a fair 

 number of distinct canals with a large lumen are present, which 

 are probably to be distinguished from the solid epithelial columns. 

 Such large canals are not as a rule present in the rabbit. In the 



1 Loc. cit. 



- Archivf. mikr. Anat. Vol. x. 



3 Archivf. Anatomic, Pliysiologie, u. Ifiss. Median. 1874. 



4 Loc. cit. 



