XXI 



3._ Thoroughly mix equal parts of white of egg and 

 glycerine ; filter. This is one of the simplest and best means ; 

 or 



4. Filtered white of egg, 50 c.c. 

 Glycerine 50 c.c. 

 Sodium salicylate i gramme. 



Shake well and filter (this takes about a week). The solution 

 keeps well for six months or more ; or 



5. Simply use fresh white of egg ; smear thinly over ; dry. 



Mounting Media, etc. 



I. Farrant's Solution. — ■ 



i. Take equal parts of glycerine and a saturated solution 

 of arsenious acid. Add powdered gum arable till the solution 

 is saturated ; or 



ii. Pure gum arable, 40 grammes. 

 Water 40 c.c. 



Glycerine 20 c.c. 



Carbolic acid i gramme. 



[or Thymol o'3 grammes.] 



Powder the gum and dissolve in about one hundred and fifty 

 c.c. of water by boiling, add the carbolic acid, dissolved in a 

 a little water, filter through a hot filter, changing when 

 clogged, evaporate until it is about eighty c.c, then add the 

 glycerine. 



2. Acetate of Potassium. — Saturated solution. Cement 

 the cover- glass with gold size, dammar lac. This is used for 

 osmic preparations, and for glycogen stained with iodine, etc. 

 Glycerine Jelly. — Glycerine 70 c.c. 



Water 60 c.c. 



Gelatine 10 grammes. 



Thymol o'5 grammes, 



or one gramme of phenol to each one hundred grammes of the 

 mixture. 



- Dissolve the gelatine at forty degrees in a water bath ; add 

 the glycerine (warmed) ; powder the thymo| and mix with a 

 little water, and stir in ; add the beaten-up white of an egg ; 

 stir continuously ; warm to eighty-five degrees ; filter through 

 a hot filter. 



To Mount Delicate Objects 



Place in ten per cent, glycerine, allow this to concentrate 

 in the air, and then transfer to the jelly. 

 C I 



