U8 



PROCEEDINGS OF SECTION B. 



1888. 



The information given in the above table is also i^epresented by 

 the charts. (Plates III. and lY.) 



Taking the mean of the above re.sults we find that an acre of 

 land at Lincoln receives annually about 179 lbs. of dissolved 

 solids, of these 60.5 lbs. consist of chlorine equivalent to 133 lbs. 

 of chloride of sodium ; about 15 lbs. of sulphuric anhydride equal 

 to about 26.5 lbs. of sodic sulphate ; and a little over 2 lbs. of 

 nitrogen, one half of which exists as niti'ic acid and the remainder 

 is made up of nearly equal parts of nitrogen in the form of 

 ammonium compound ai^d organic matter. 



It has been previously stated that the quantity of solids 

 received does not depend entirely on the total amount of rain, 

 but more on the quantity and frequency or otherwise of the 

 separate rainfalls. If we group our results in lbs. per acre 

 according to season as in Table Y., several interesting points are 

 brought out. We see that although the mean maximum rainfall 

 occurs in the winter months, yet the amount of solids is about 

 the same as that received in the autumn months with only about 

 three-fourths of the rainfall. 



The maximum amount of chlorine and sulphuric anhydride ai-e, 

 according to the means in this table, received in the autumn, 

 whereas nitrogen in all its forms attains its maximum in the 

 spring. 



