EXAMINATION AND PEESEUVATION MEDIA. 275 



p. 138 ; Journ. Roy. Mic. Soc., 1890, p. 411). Equal parts of glycerin 

 jelly (FoL's second formula, post, 432), Favrants' solution, and glycerin. 



419. COLE'S G-uru and Syrup Medium. See 178. 



420. APATHY'S Gum and Syrup Medium (see 328). This 

 medium is recommended by APATHY in a general wa}*. and 

 not merely for the special purpose for which it is quoted in 

 328. It sets very hard, and, combined with a paper cell 

 (see 453), may be used for ringing glycerin mounts. 



421. FABRE-DOMERGUE'S Glucose Medium (La Nature, No. 

 823, 9 Mars, 1889, supp.). 



Glucose syrup diluted to twenty- 

 five degrees of the areometer 

 (sp. gr. 1-1968) . . 1000 parts. 



Methyl alcohol . . .200 



Glycerin . . . 100 



Camphor to saturation. 



The glucose is to be dissolved in warm water, and the 

 other ingredients added. The mixture, which is always acid, 

 must be neutralised by the addition of a little potash or 

 soda. 



This medium is said to preserve without change almost all 

 animal pigments. 



421a. BRUN'S Glucose Medium (from F ABBE-DOME RGUE'S Pre- 

 miers Principes du Microscope et de la Technique micro- 

 scopique, Paris, 1889, p. 123). 



Distilled water . . . .140 parts. 



Camphorated spirit . . . 10 ,, 



Glucose . . . . . 40 



Glycerin . . . . . 10 



Mix the water, glucose, and glycerin, then add the spirit, 

 and filter to remove the excess of camphor which is pre- 

 cipitated 011 mixing. Dr. HENNEGUY informs me that this 

 liquid is often preferable to glycerin, because it preserves the 

 colour of preparations stained with aniliii dyes, methyl green 

 included. 



422. Levulose is recommended as a mounting medium by BEHEEXS, 

 KOSSEL, u. SCHIEFFERDECKEK (Das MiJcTosJiop u. d. Meth. cl. mi~k. Unters., 



