272 PRACTICAL HISTOLOGY. 



suspensory ligament, the zonule of Zinn, and the 

 part of the hyaloid membrane continuous with this, 

 so that the separated lens appears girdled by a deli- 

 cate, somewhat crumpled-looking, membranous zone, 

 closely adherent at its inner border to the equator of 

 the lens, and bounded outwardly by a ragged mar- 

 gin the torn edge of the hyaloid. Cut out with 

 fine scissors a segment of this zone, including its 

 whole breadth, and with a section-lifter transfer the 

 piece so removed to logwood solution (Kleinenberg's). 

 When sufficiently stained and it stains very readily 

 transfer it to a dish of water, and from this float 

 it on to a slide, avoiding all creases except of course 

 the natural ones of the zonule. It may then be 

 covered, and the water in which it is mounted re- 

 placed by glycerine. Or, instead of placing it in the 

 water, it imiy be transferred from the logwood to 

 spirit, and then passed through oil of cloves and 

 mounted in dammar. These preparations exhibit 

 well the folds and striations of the zonule, and the 

 rounded corpuscles, like white blood corpuscles, 

 which are dotted here and there over the surface of 

 the hyaloid. 



THE BLOODVESSELS OF THE EYE. 



For the demonstration of the bloodvessels the head 

 of an albino rabbit should be injected, a canula being 

 placed in each carotid, and the two canulas con- 

 nected to the arras of a Y-shaped tube, the stem of 

 which is brought into communication by an India- 

 rubber tube with the injection bottle. After the 

 blood has been driven out of the vessels before the 

 flow of injection fluid, the neck of the animal, just 

 below the place where the canulas are inserted, is 

 surrounded by a loop of wire, which is drawn as 

 tightly as possible to prevent the escape of the injec- 

 tion ; and the pressure is then raised to about four 

 inches of mercury and kept there for some minutes, 

 so as to make certain that all the bloodvessels shall 



