764 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



would bring crops to maturity, the average depth of water used, as 

 measured at the head-gate, was in 1900 4*18 feet, and the average of 

 the percentages of losses by seepage and evaporation shows a loss per 



Fio. 174.- -Iris buchaiuca. [Journal of Horticulture.) 



mile of 2*47 per cent., the heavy losses in Utah canals making the 

 average so large. 



In the Discussion of Investigations, by C. T. Johnston, descriptions 

 and figures are given of the instruments used, such as water registers, 

 sample traps, and current meters. — E. A. B. 



