100 



LIST OF APPARATUS AND CHEMICALS 



REQUIRED FOR THE ANALYSIS OF 



MILK AND INFANTS' MILK-FOODS. 



Blue and red litmus paper, turmeric paper, distilled water, 

 absolute alcohol and ether. , 



Chemically pure hydrochloric, nitric, sulphuric and acetic 

 acids. 



Sulphuric acid of commerce (66° B), and calcium fluoride in 

 powder, for cleaning platinum vessels. 



Dilute sodium, or potassium hydrate solution of known 

 strength, to neutralize the hydrochloric acid used for inversion. 



Potassium, hydrate solution of 1.048 specific gravity (50 potas- 

 sium hydrate and 1000 water), to neutralize Eitthausens' cupric sul- 

 phate solution. 



Cupric suli)hate solution (63.5 grms. crystallized cupric sulphate 

 dissolved to 1 liter). 



Fehling's solution (see page 28). 



Uranium, solution according to Neubauer, see Fresenius' Quan- 

 titative Analysis. 



Iodine solution (1 iodine to 50 water). 



Phenolphtalein as indicator in volumetric analysis. Dissolve 

 1 part in 30 parts of alcohol, and use from 1 to 2 drops at a time. 



Potassium f err ocyanide solution as a test for copper, in Feh- 

 ling's volumetric sugar determination. 



Glased paper, 



Swedish filter paper, free from, ashes, is obtained according 

 to P. T. Austen, by soaking for from 4 to 5 days the filters, 

 which had previously been washed with diluted hydrochloric acid, 

 in a mixture of 30 c.c. concentrated hydrochloric acid, 15 c.c. com- 

 mercial hydrofiuoric acid, and 500 c.c. distilled water. The fluid 

 is then poured off, and the filters are washed with warm water 

 until no muriatic acid reaction is obtained. They are then dried. 

 The following manufacturers prepare paper free from ashes : 

 Schleicher & Schuell, Darren, Prussia ; Linke and Rosala, Bruenn. 



A fine chemical balance and weights. 



Microscope, magnifying power to 400 or 500 linear dimension. 

 Thermometer (Celsius). 



Specific gravity bottle with thermotneter) Geissler, in Bonn, 

 Prussia. 



