28o 



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' '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 (four. 

 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, (four. Appl. Micr. 1898, p. 129). 



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

 tures. As shown i?i 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. 139) . 



