PARTI.] Fluctuations of Rise and Fall in Water-level in Each Year. 227 



The following tables show the amount of rise in each year, the amount of fall from 

 one year to another, and the relations of the lowest water-level of each year to one 

 another, taking that of 1870 as zero. 



TABLE XXX. 



A'iixonnt of fluctuation fromi lowest to highest level in each year from 1870 to 1876. 



The greatest rise during the period (8"2) occurred in 1871, the second in order (7*9) 

 in 1876. The minimum rise (4*4) occurred in 1872. 



TABLE XXXI. 



Amount of fluctuation from highest level of one year to lowest level of the next. 



The greatest fall occurred in 1871-72, the next greatest in 1876-77, that is the 

 greatest falls succeeded the greatest rises. The least falls also followed the least rises. 



TABLE XXXIL 



Comparative level of the tuater when farthest from, the surface in each year from 



1870 to 1877.* 



The soil-water in 1871 was about 10" nearer the surface when at its lowest than it 

 was in 1870. In 1872 it was 1" nearer the surface than in 1870. In 1873 and 1874 it 

 was 3" and 5" lower than in 1870; in 1875 it was 3" higher ; in 1876, 5" lower; and in 

 1877 it attained the same level as in 1870. 



The averages show that the water is nearest the surface in September, and thereafter 



* The ;plus sign indicates elevation above the level of 1870 ; the mi7ius sign the reverse. 



