CHAP. XI. | Till- CONTROL OF INSEI 1 PESTS OF CROPS. 12/ 



10,000 sq. metres 1 hectare 2*471 



1 acre = -.105 hectares. 

 1 14 sq- inches = 1 sq. ft. 

 9 sq. ft. = 1 sq. yard, 

 jo', sq. yds. 1 sq. | 

 40 sq. poles = 1 rood. 



ods = 1 acre = 4,^40 sq. yds. 

 - i sq. mile. 



