MATERIALS 



207 



SPECIAL APPARATUS. 



Fermentation tubes. 



Polariscope. 



Esbach tubes. 



100 c.c. volumetric flask. 



500 c.c. volumetric flask. 



Duboscq colorimeter. 



Distilling apparatus. 



Cylinders, bottles, Folin absorp- 

 tion tubes for ammonia and 

 urea determinations. 



Compressed air (or a water 

 pump). 



LIQUIDS. 



Apparatus for producing H 2 S. 



Sodium nitroprusside sol. 

 (fresh). 



Methyl orange, 1% aqueous. 



Calcium chloride sol. 



Lead acetate sol. 



Alizarine red, 1% aqueous. 



1% Potassium dihydrogen phos- 

 phate, 30 c.c. per man. 



Neutralized potassium oxalate 

 sol. (saturated). 



Sodium hydroxide, saturated. 



Kerosene. 



Formalin, diluted, 1-4 and neu- 

 tralized with N/10 NaOH 

 (phenolphthalein) . 



Folin-Schaffer reagent. 



10% Ammonium sulphate. 



N/20 Potassium permanganate. 



N/2 Potassium bichromate. 



Standard silver nitrate. 



Standard ammonium sulphocyan- 

 ate. 



Ferric ammonium sulphate, sat'd 

 (iron alum). 



Standard barium chloride. 



Special sodium acetate. 



Standard uranium acetate. 



Esbach 's reagent. 



Quantitative, Fehling 's. 



Benedict's sol. 



