128 CHAPTER X. 



The watery fluid causes the double sheet of collodion to 

 become detached from the glass, holding the sections fast 

 between its folds. It is then easy to stain, wash, dehydrate, 

 and mount in the usual way, merely taking care not to use 

 alcohol of more than 90 to 96 per cent, for dehydration. 

 Weigert recommends for clearing the mixture of xylol and 

 carbolic acid ( 167). 



The series should be cut into the desired lengths for 

 mounting whilst in the alcohol. 



A good method for large and tliic'k sections. 



For BLOCHMAN'S modification see 191. 



STRASSER takes gummed paper instead of the glass plates used in this 

 process. See the papers quoted 192. 



See also WINTERSTEINER (Zeii.wiss. Mile., x, 1893, p. 316) and KUBO 

 (Arch. mik. Anat., Ixx, 1907, p. 173). 



199. Obregia's Method. Slides are prepared as directed 

 ( 191), the sections are arranged on them and covered with 

 celloidin or photoxylin and evaporated as described, 191. 



For DIMMER'S modification see also 191. 



200. Collodion Film Method GRAHAM KERR (in litt., 1908) 

 seriates on Kodak films. A film has the emulsion removed 

 by hot water. The sections are arranged on a dry film, and 

 the applications of a drop of absolute alcohol and ether (or 

 an atmosphere of alcohol and ether) suffices to weld them 

 into a mass with the film. The sheet may then be stained 

 and mounted, or rolled up and stored in cedar oil. 



Other Methods for Celloidin Sections. See 193 (Foi.) and 

 182 (Oi/r). 



