TIM. (,I:KM-I.\ 



pn 06 - \\ it li :: \a-c-i! . : v into the pri: 



- stalk (li Tin- \:isrul:ir loop then 1- 



IK! out new lateral branches; likewise tin- cor. 

 matrix, which increases great ly and N characterised 



l.y its extraordinarily .-IL'li' .: proportion of 



\\at. are also to bo found in it here and 



there i-ola'ed stellate con: sue cells: lint the-e disappear 



later, and in their place occur migratory cells (leucocyte^), which are 

 a nmcd tO he immigrated uhite blood-cor; 



There are two opposing viewa re^ardin. 



ment of the vitreous l.ody. According KB we have to do, 



not with a genuine connective substance, but with a tran-ud at ion, 

 a fluid. which has been secret 1 from the va-vular looj ; the 

 are from the he^innin^ simply immii.Tat.-d white hl,nd c..rpi: 

 KOI.I.IKKH, S HWALBE, and other investigators, on the contrary, 

 regard tin 4 vitreous body us a genuine connective Mihstanee. Acconl- 

 inir i( SCHWALIIK'S delinition, to which I adhere, it << I an 



dhurly watery c-onnect ive tissue, whose fixed cells have early 

 di-appeaied. but whc-e int eriil irillar sub-taiuv inlilt i-aT.-d with 

 i- traversed by migratory cells. The vitreous body is at 

 Mirrounded by a structureless membrane, th-- 



which, according to some in ventilators, belongs to the retina, al- 

 though, according to the researches of SCIIWALBE. tliis \ iew is not 

 admissible 



The vitreOUfl body, which in the adult is quite d. .f blood- 



is, i- hountifully su]>plied \\ith them in the embryo. They 

 come from the art /, the branch of the ophthalmic 



artery that runs along the axis of the optic n 



The artcria ccntralis retiiue is prolonged from the papilla of the 

 optic nerve as a brunch which i- '"d as the arteria hyal.-idea. 



Tlii-, resolved into several brunches, runs forward through the 

 vitreous body to the pos'erior .-urfucc of the len-. \\ in-re its numerous 

 terminal ramilicat: d out in the tunica vasculn-a, and at the 



ejuator pasv over on to the anterior face of the lens. During the 

 iu>t months of embryonic life the vessels of the l>ody, to- 



gether with the nutritive membrane of the len>. undergo degenera- 

 tion; they entirely disappear, with the exception of a rudiment of 



the chief stem, which runs forward from the entrance of the optic 

 nerve to the anterior surface of the vitreous body, and during the 

 degeneration is converted into a canal tilled with fluid, the canalis 

 hyaloi 



