TRANSPARENT SPECIMENS 



179 



Table IV. 1 — Continued 



Isobutylmethacrylate 

 Diaphane, Euparal 



Polyvinyl alcohol 

 Camsal 



Lucite 



Siloxane silicone DC804 



Daniar 



Balsam 



Clarite 



Styrax 



Bakelite 



Arochlor 



Hyrax 



Naphthrax 



Balsam of Tolu 



Realgar 



White Karo corn syrup 5 cc, Certo 5 cc, water 3 cc. Monk (1938). 



Fructose syrup (1.43): 30 grams fructose (levulose) dissolved with gentle heat 



in 20 cc water. 

 Apathy medium (1.42-1.52): pure gum arable 50 grams, i^ure cane sucrose 50 



grams, water 50 cc, thymol 0.05 gram. Pantin (1946). Lillie (1948) uses 



instead 100 cc water and states that Highman adds 50 grams potassium acetate 



or 10 grams .sodium chloride. 

 Dihutyl phthalate 5 cc, xylene 35 cc, polystyrene 10 grams. 

 Isobutyl methacrylate polymer and Arochlor can be dissolved in xylene to give 



media after hardening from 1.495 to 1.525. Bradfoot and Schwartz (1948). 

 Wright's medium: equal parts of phenol and camphor to which is added twice 



its volume of thin gum sandarac in isobutyl alcohol. Kenohan (1928). 

 Polyvinyl alcohol 2 grams, 70% acetone 7 ml, glycerin 5 ml, lactic acid 5 ml, 



water 10 ml. Acetone is slowly added to the resin and the liquids combined and 



stirred in drop by drop. Heat till clear (1.382). Gray and Wess (1950). 

 C-M medium (1.428): methyl cellulose 5 grams, Carbowax 4000 2 grams, di- 



ethylene glycol 1 ml, 95% EtOH 25 ml, lactic acid 100 ml, dist. water 75 ml. 



Methocel and EtOH mixed and added to the rest of the medium. Place in 



oven for 3-5 days until consistency is right. Clark and Morishita (1950). 

 Polyvinyl lactophenol: 56% by volume polyvinyl alcohol stock solution, phenol 



22%, lactic acid 22%. Downs (1943). 

 Lillie (1950) describes a number of media, and Greco (1950) has published a table 



of refractive indices of the solutions of solid media. 



* Can be modified to 1.41 and 1.75. Wotton and Zwemer (1935). 



t with a-bromonaphthalene 1.73. 



Notes: Values without references are from general sources. The indices will vary 

 with temperature and the extent of evaporation of any solvent from the mixture. 

 For accurate work the refractive index should be measured. These materials have 

 been used in microscopy and are offered as suggestions for the microscopist. 



