80 



THE ROYAL SOCIETY OF CANADA 



We believe that the negative flow was caused by absorption and 

 we expect the distilled water tube to give a positive flow when the soil 

 has become saturated. Whether it will do so remains to be seen. 



Two tubes were prepared in the same way and filled with the 

 strong sugar solution. They were then fitted with open arm mercury 

 manometers and placed in distilled water. Strong pressures have 

 developed in each case. 



Table 10. 



Giving the Pressures in centimetres of Mercury and the Duration of the 



Experiments, to date. 



GENERAL CONCLUSION. 



The results obtained in these nine tests show that, whatever the 

 cause may be, water does move through the soil from a weak soil 

 solution toward a strong soil solution. 



The results agree with the theory that this movement is caused 

 by osmosis. 



1. C. J. Lynde. On Osmosis in Soils. Soils act as Semi- 

 Permeable Membranes. Journal of Physical Chemistry, Vol. 16, 

 No. 9, page 750, December (1912), and Proceedings of the American 

 Society of Agronomy, Vol 4, 1912. 



C. J. Lynde and F. W. Bates. On Osmosis in Soils. Journal 

 of Physical Chemistry, Vol. 16, No. 9, page 766, December (1912), 

 and Proceedings of the American Society of Agronomy, Vol. 4, p. 108, 

 1912. 



C. J. Lynde and H. A. Dupré. On Osmosis in Soils. Transac- 

 tions of the Royal Society of Canada, Vol. VII, Third Series (1913) 

 and Journal of the American Society of Agronomy, Vol. 5, No. 2, 

 p. 102(1913). 



C. J. Lynde and J. V. Dupré. On Osmosis in Soils. Transac- 

 tions of the Royal Society of Canada, Third Series, Vol. VIII (1914), 

 and Journal of the American Society of Agronomy Vol. 7, No. 1, p. 15, 

 1915. 



