so 



15 



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^^^zziWiL. 



Fig. 15. Osmometer, Type D (left), with straight column of solution for measuring 

 pressure. Scale in centimetres. Osmometer, Type C (right), for high pressures 

 with mercury manometer: (1) A rigid collodion tube, 20 c.c. capacity, in jar 

 holding 500 c.c. of outer liquid. (2) Rubber connection. The glass tube from 

 (2) to (3) is filled with liquid paraffin. Beyond (3) there is water. (4) Rubber 

 connection with clip (not shown here). (5) Glass T-tube, with water down to 

 level B. (6) Glass rod in rubber tube, for adjusting the pressure. (7) Glass tube 

 open to air, or fitted with a soda-lime tube. W = level of outer liquid; B = leve 

 of mercury in manometer limb, 6 mm. in diameter; L = level of mercury in 

 manometer limb, 0-7 mm. in diameter. Above the mercury at L there is a dro 

 of lactic acid. 



