280 



APPARATUS FOR SECTIONING 



\CH:X 



FIG. 226. Circulation board, especially for Necturus. This is prepared from 

 a board about 8 x 20 centimeters. Near one edge it has a hole for a perforated cork. 

 On the top of the cork is cemented a thick cover-glass with shellac or rubber cement. 

 The cork can be raised or lowered in the board. The gills of Necturus or the 

 web of a frog" 1 s foot can be spread out on glass over the cork. (four. Appl. Micr. , 

 1898, p. 131. 



FIG. 227. Copper can with screw top for collecting 

 embryologic material and small aquatic animals. It was 

 especially designed for collecting with a bicycle (Jour. 

 Appl. Micr., 1898, p. 131). 



FIG. 228. Egg pipette. This is made by putting a 

 short piece of soft rubber tubing over the end of a glass 

 pipette with rubber bulb. With this one can handle the 

 eggs both fresh and hardened without any degree of in- 

 jury. (Jour. Appl. Micr. 1898, p. 



FIG. 227. 



FIG. 229. Washing apparatus for tissues fixed in osmic and chromium mix- 

 tures. As shown in the figure the apparatus is connected with the water pipe by a 

 small side cock. It is composed of a double vessel, the inner one being made of per- 

 forated brass. There are special perforated -dishes to insert in the little compart- 

 ments. This apparatus is convenient for washing cover-glasses, for the washing 

 out for iron hematoxylin, etc. The deeper box at the right answers for the slide 

 baskets or holders (Fig. 



