434 APPENDIX 



Use. — For mounting microscopical objects which are too 

 transparent when mounted in balsam. (See Introduction, 

 p. xxii.) 



FABBANT'S UEDITTM. 



Prepa/ration. — Dissolve 400 grms. white gum arable in 400 c.c. 

 water without heat, stirring occasionally : add 200 c.c. 

 glycerin : strain through clean flannel if necessary. Keep 

 in a stoppered bottle with a piece of camphor. 



Use. — Same as glyceria-jeUy, but it is used cold, and objects 

 may be transferred to it direct from water. It soon 

 hardens at the edges : ringing with varnish is therefore 

 unnecessary. 



CANADA BALSAH. 



Prepa/ration. — May be used as bought from the chemist, or 



diluted to a suitable consistency with benzol or turpentine. 



StiU better, evaporate to dryness : powder and dissolve in 



chloroform, benzol, or txirpentine. 

 Use. — The most useful of all media for mounting stained 



objects. (For mode of using, see Introduction, p. xxx.) 



V. MICKOTOMIST'S MEDIA. 

 GITM-WATEB. 



Prepa/ration. — Dissolve gum-arabic in 3 times its weight of 

 water without heat : allow to stand : strain if necessary. 



Use. — For impregnating objects to be cut by the freezing 

 microtome. 



FABAFFIN. 



Melting point about 56° C. 



Use. — For imbedding objects to be cut into sections. 



SOFT PABAFFIN . 



Melting point about 40° C. 



Use. — (1) To mix with hard paraffin when used in a cold 



room (see Introduction, p. xxvui). 



(2) To smear the sides of the block that is being cut, 



so as to ensure the sections cohering by their edges into 



a continuous ribbon. 



