412 Solution Preparation (sec. 1) 



Scott's Solution. 



sodium bicarbonate 2.0 gm. 



magnesium sulfate 20.0 gm. 



distilled water 100.0 ml. 



Add a pinch of thymol to retard molds. 



SODIUM THIOSULFATE SOLUTION (hypo), 5% 



sodium thiosulfate NaoSaOg 5.0 gm. 



distilled water 100.0 ml. 



CLEANING SOLUTION FOR GLASSWARE. 



Strong: 



potassium dichromate 20.0 gm. 



water 200.0 ml. 



Dissolve dichromate in water; when cool add very slowly: 

 sulfuric acid, concentrated 20.0 ml. 



Weak: 



potassium dichromate, 2% aqueous 9 parts 



sulfuric acid 1 part 



Sufficiently strong for most purposes. 



Adhesive Solutions 



Mayer's Albumen Fixative 



Beat white of an egg (only until well broken up, but not stiff) with 

 egg beater and pour into tall cylinder. Let stand until the air brings 

 suspended material to the top (overnight). Pour off liquid from bottom 

 and to it add an equal volume of glycerol. A bit of sodium salicylate, 

 thymol, merthiolate, or formalin (1:100) will prevent growth of molds. 

 Many technicians filter their solution through glass wool, but the author 

 has found this of no advantage. 



Faulkner and Lillie {1943B) substitute dried egg white. A 5% solu- 

 tion of dried egg white in 0.5% NaCl is shaken at intervals for one day. 

 Do not allow it to froth. Filter in a small Buchner funnel with vaciuim. 

 Add an equal amount of glycerol and 0.5 ml. of 1:10,000 merthiolate 

 to each 100 ml. of solution. 



Masson's Gelatine Fixative 



gelatine 50.0 gm. 



distilled water 25.0 ml. 



