MILK AND MILK PRODUCTS 



21 



the arrangement used in my laboratory has been found very 

 satisfactory. A double- Y, terra cotta drain-pipe, about 20 

 centimeters internal diameter, is connected by an elbow di- 

 rectly with the chimney-stack. The digestion flasks are sup- 

 ported as shown in the rough sketch, figure 4 (not drawn 

 exactly to scale). Two flasks can be operated at once. The 

 central opening is convenient for other operations producing 

 fumes. Openings not in use are closed by circles of heavy 

 asbestos. 



FIG. 3 . 



FIG. 4. 



The apparatus shown in figure 3 is used when many de- 

 terminations are made. As corrosive vapors are given off, 

 it must be placed under a hood. The central opening in the 

 ventilating pipe shown in figure 4 will be satisfactory; the 

 mouths of the flasks should be well inside the margin of the pipe. 



When the liquid has become colorless or very light straw 

 yellow, it is allowed to cool, diluted with 100 c.c. of water if the 

 smaller form of flask has been used, the liquid transferred to the 

 distilling flask, and the digestion flask rinsed with two portions 

 of water, 50 c.c. each, which are also transferred to the distilling 



