248 TWENTY-FO UR TH LECTURE. 



controversies ; not the lymph corpuscles wandering through 

 them, but rather the "fixed" corneal cells (Fig. 200, to the 

 left and below). They are stellate and water-wheel-like cells, 

 the nucleus of which is always invested by some protoplasm, 

 while the peripheral portions are metamorphosed into homo- 



Fig. 200. — The human cornea impregnated with silver. The corneal corpuscles, that is, the system 

 of juice-spaces, colorless. To the left, below, four metamorphosed parenchyma cells. 



geneous veil-like plates. The cells probably have a limited 

 contractility. Their processes do not, according to our views, 

 form any connected net-work. Hence, a portion of the juice- 

 canals remain filled with fluid. All this is disputed by others, 

 however. No one should here leave the decision with confi- 

 dence to one reagent, such as gold, for instance. 



The sclerotica (p. 57) is a firm connective-tissue membrane, 

 and consists of bundles arranged meridionally, with others 

 crossing them in an equatorial direction. In front they pass 

 continuously over into the modified hyaline connective tissue 

 of the cornea. It also contains regular passages with lymph 

 corpuscles and in part colorless, in part pigmented connective- 

 tissue cells (Waldeyer). It appears to have nerves only at 

 the corneal border. 



At the margin of both membranes, although belonging to 

 the inner surface of the sclerotica, we meet with a complicated 

 ring-shaped reservoir. This is the sinus Schlemmii (Fig. 

 199, d). It has been declared to be a venous reservoir 



