WHITE FIBROUS TISSUE. 



281 



shown by Fig. 179. The tubular interspaces are doubtless filled 

 with a transparent fluid. No vessels extend into the substance of 



Fig. 179. 



Fig. 180. 



Vertical section of the sclerotic and cornea, showing the continuity of their tissue between the 

 dotted lines, a. Cornea. &. Sclerotica. In the cornea, the tubular spaces are seen cut through, and 

 in the sclerotic the irregular areolse. Cell-nuclei, as at c, are seen scattered throughout, rendered 

 more distinct by acetic acid. (Magnified 320 diameters.) 



the cornea. Those of the sclerotica form loops extending to its 

 margin, as shown by Fig. 180. Some superficial branches belong- 

 ing to the conjunctiva extend, however, 

 in front of the cornea to the distance 

 of J- to J of a line from its margin, as 

 seen in the figure. It is suggested by 

 Kolliker that vessels carrying the li- 

 quor sanguinis alone, may communi- 

 cate with these, and extend through- 

 out the cornea. 



That the fluid in the tubular inter- 

 spaces is the blood-plasma, may be in- 

 ferred from the fact that though there 

 are no vessels in the cornea, incised 

 wounds heal very readily. This is the 

 case usually after the removal of cata- 

 ract by extraction. Since the plasma Nutrient vessels of the cornea. A. Su- 

 ,-, -, /wiii.i perficial vessels belonging to the con- 



must, however, be afforded by the pe- junctival mem brane, and continued 



rimetral Vessels, it is important not tO over the margin of the cornea. B. Ves- 

 ... sels of the sclerotic returning at the 



carry the incision further round than margin of the cornea, 

 is actually necessary. 



In diseased conditions of the cornea, however, the deep-seated 

 vessels may be prolonged into its entire substance, while the super- 



