38 



OSMOTIC PRESSURE OF AQUEOUS SOLUTIONS. 



in which the vents are provided for in the metallic parts of the appa- 

 ratus. When alljcontact of the solutions with metals is to be avoided, 

 as in the case of electrolytes, the vent is of glass and is made a part of 



Fig. 21. 



Manometer with glass connec- 

 tion for cells with straight 

 necks (see Fig. 14). 



the manometer, as in Figures 20 and 21, 3. It has been given a variety 

 of positions on the manometer (see Figures 12, 13, 14, and 15), but on 

 the whole that seen in Figures 20 and 21 is preferred. 



