ZOOLOGY AND BOTANY, MIOEOSCOPY, ETC. 



851 



an outer pan which is supplied with a lid. This external glass capsule 

 is of course somewhat larger than the inner or filter capsule, and its 



Fig. 158. 



Fig. 159. 



measurements are about 9 cm. in diam., and 6 cm. high. By means of 

 this apparatus, preparations are washed, stained, decolorized or dehy- 

 drated, &c., by placing the section in the inner pan, and the fluid in the 

 outer, and when the latter has acted sufficiently, the inner pan is merely 

 lifted out, and having been allowed to drain is placed within another pan 

 containing the next reagent and so on. When the reagent is expensive 

 it is advisable to use the filter-capsule without legs. When required for 

 removing all traces of acid from preparations, the apparatus is used as an 

 irrigator. 



Apparatus for inclosing microscopical preparations of botanical 

 objects mounted in glycerin.* — Dr. M. Kronfeld has devised an 

 apparatus for facilitating the inclosure of preparations with turpentine 

 resin when these preparations are mounted in glycerin and a square 

 cover-glass is used. The tool used for laying on the resin is a triangular 



instrument made of wire. The resin is applied by heating the layer-on 

 in the flame of a spirit-lamp or gas-jet, and it is to obviate the incon- 

 venience of having the several apparatus required for this purpose in 

 different places that he has brought them together. 



U (fig. 160) is a tray resting on 4 feet F ; its edges E are turned up 

 and it is provided with a handle G. It carries two circular filletings in 

 which the spirit-lamp L, and the resin-box H fit. On the side are two 

 clips T T in which the laying-on tool A, with a wooden handle, rests. 



* Bot. Centralbl., xxxiv. (1888) pp. 345-6 (1 fig.). 



