826 Dr Martin Barry on Vesicles in the 



of an epithelial lining and of a mulberry, or no trace of these 

 at all. Such states were also noticed by my friend in two 

 rabbits which he examined, besides those already mentioned. 

 In one he found two vesicles distinctly attached " by blood- 

 vessels to the fold of peritoneum inclosing the ovaries and 

 between them and the fringe of the tubes. The capillaries 

 running over the surface of these fibrous sacs were very 

 plainly seen with the current of blood in them ; yet they 

 were so transparent as to admit of a full examination of the 



interior No trace of cells or the mulberry-like body." 



A third vesicle in nearly all respects the same he found in 

 another rabbit attached to the fimbria? of the Fallopian 

 tube. 



Owen aptly termed the Infusoria a minute police, — their 

 office being to take up and retain in organic life particles 

 about to be lost from it.* This comparison may perhaps be 

 applied to the capillaries that ramify over the vesicles contain- 

 ing a rotating body ; but in the very opposite way. Instead 

 of retaining them in organic life, the capillaries lay hold of 

 these vesicles as foreign bodies to be expelled, and they ac- 

 cordingly take them up and effect their expulsion. In this, 

 however, they seem to be assisted by the vesicles themselves. 

 For as the rotations exhibited by a fecundated ovum belong 

 to the changes essential to development, so, it may perhaps 

 be said, do the rotations of the imfecundated mulberry-like 

 body in its ovisac belong to the changes leading to dissolu- 

 tion. 



The foregoing relates to the ovisac with an wnfecundated 

 ovum; the following to the ovisac after fecundation. lam 

 about to give the substance of several more of the facts pub- 

 lished in my second series of " Researches in Embryology" 

 in 1839, viz.— 



1. Fecundation of the mammiferous ovum takes place in 

 the ovary. \ 



2. A large aperture is seen in the ovisac just before the 

 expulsion of the Rabbit's fecundated ovum from the ovary. J 



« Huntcrian Lectures. t Phil. Trans., 1839, \>. 350. { lb., PI. V., fig. 98. 



