426 APPENDIX. 



closed, but are traversed by capillaries ; and that it is a gland 

 of the same class, distinguished from a Peyer's patch only in 

 the fact of its elements being aggregated, not on a plane, but 

 round a diverticulum of mucous membrane. 



Finally, we suggest that the liver itself is but a huge tonsil 

 — a vascular gland, with what might be termed a false duct ; 

 and we indicate the agreement of this doctrine with the view 

 taken by Dr. H. -Jones with regard to this organ, and we may 

 add, with the recent beautiful researches of Bernard. 



§3. 

 Corpora lutea. — Professor Kolliker does not appear to be 

 acquainted with the exact description of the structure of the 

 corpora lutea } given by Mr. Wharton Jones so long ago as 

 1843-4, in his 'Report on the Ova of Man and the Mammifera 

 before and after Fecundation/ 'Brit, and For. Med. Review/ 



1843, and in a paper entitled 'Microscopical Examination of 

 an early Corpus Luteum ,' in the 'London Med. Gazette' for 



1844. From the latter we extract the following passages, 

 premising that to the naked eye a section of this corpus luteum 

 presented the appearance of a dark clot with a central mem- 

 branous shred from which processes radiated. 



" The body in question (early corpus luteum) is of a lenti- 

 cular form, about A in. in diameter, and about -^ in. thick, 

 and projects on the surface of the ovary by somewhat more than 

 half its diameter. The prominent part being covered merely 

 by the indusium of the ovary, the dark-brown red colour of 

 the body shines through. Examined microscopically the 

 central membranous shred was found to present the following 

 structure : 



"1. On its free surface a fine film of tesselated epithelium. 

 2. Invested by this epithelium was a stratum of finely inter- 

 woven transparent fibres, with dark contours, somewhat like 

 elastic tissue. 3. Outside all was a layer identical in structure 

 with the stroma of the ovary, the same structure as that 

 composing the principal thickness of the walls of Graafian 

 follicles. 



" The membranous processes possessed a similar structure, 

 and were found to be continuous with the stroma of the ovary. 

 That part of the body next the substance of the ovary, had, by 



