76 



THE ROYAL SOCIETY OF CANADA 



SIXTH TEST. DOES THE FLOW VARY WITH CHANGE OF 

 TEMPERATURE ? 



If the flow is an osmotic phenomenon, an increase in temperature 

 should cause an increase in flow for the following reasons (1) the 

 osmotic pressure of the soil solution would increase with increase 

 of temperature; (2) the concentration of the soil solution would prob- 

 ably increase with increase of temperature; (3) the viscosity of the 

 water would be decreased with increase of temperature and thus it 

 should move through the soil more rapidly. 



To determine how the flow varies with change of temperature, 

 two tubes were set up as shown in Fig. 2, and the daily flow was 

 measured at room temperature in the laboratory and at higher temper- 

 atures in an electric oven. The oven could be regulated to within 1 

 degree. 



Table 6. 



Giving the Average Daily Flow in linear centimetres at Different Tem- 

 peratures AND THE viscosity OF WATER AT THESE TEMPERATURES. 



Table 7. 



Giving the Ratios of the Daily Flow and the Ratios of the Fluidity of 

 Water at these Temperatures. 



