ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 



711 



The knife A A is large, measuring 13 inches in length, including 

 handle and 1| inches in breadth. It is slightly concave on both sides, 

 and is fitted into a brass frame c,c, 7^ inches by 3i inches. Two 



Fig. 134. 



strong brass springs and two sliding clamps hold it in place. The 

 knife and frame are modifications of Dr. Curtis's plan. 



The well is so large that it will hold an ordinary kidney after 

 hardening, or, at least, so much of it that a section may be made of 

 the whole organ at one sweep of the knife. 



Each revolution of the milled head raises the preparation ^ T T inch, 

 and as it is divided into 30 divisions, each division represents ^^ 

 inch. G is an indicator for marking the thickness of the sections, 

 E E are tubes to fit in well, F F plugs, H H covers to the box, and 

 K a binding screw to attach the latter to a table. 



Windler's Microtome.* — This (Fig. 135) is a modification of 

 Rivet's microtome, but retains little more than the principle of the 

 original, i. e. the inclined (c d) and horizontal (b) slides attached to 

 the vertical plate (a), these parts being all of metal. Instead of the 

 ordinary clamp, which is very unsuitable for delicate objects, the 

 inclined slide on the left supports a brass slide e, the under surface 

 of which is lined with lead. Metal cases of different sizes I for the 

 object to be cut, can be placed within it, and fixed by the screws n. 



* Bericht wiss. Instrumente Berliner Gewerbeausstelluug iin Jahre 1879 (L. 

 Loewenberg, 1880) pp. 309-12 (2 figs.). 



