Mr Vegard, On the Free Pressure in Osmosis. 



21 



The pressure gradient is y A, and if we knew I this could be 



found ; but at all events we see that as far as -j can be considered 



constant X would give a relative measure for the pressure gradient 

 near the solvent surface. In the case where w is a very small 

 quantity we get 



q = A\ = Friction Pressure (5). 



So/{/ tcon- 



Fig. 2. 



SoLuent 



In the case of our system we have seen that for small velocities 

 wis very small and the free pressure is determined by equation (5). 

 Regarding equation (2) we further see that for small velocities the 

 free pressure is equal to the osmotic pressure. 



9. In order to explain the properties shown by the osmotic 

 velocity we are led to assume that also in the case of higher 

 concentrations the quantity n will be very small in all those cases 



