88 



Swede Midge in parts of Yorkshire 



Total number of districts 11 11 11 11 11 



At Garforth the progress was more rapid. The indices were: 



1913 Brood I 2 



1913 Brood II No survey 



1914 Brood I 22 

 1914 Brood II 32 

 1914 Brood III 76 



3. In the East Riding area the indices are on the whole higher in 

 the northern part of the area than in the southern. If we divide the 

 whole area into two parts, a northern part containing districts I, II, 

 III, IV, V, and VI, and a southern part containing districts VII, VIII, 

 IX, X, and XI, and calculate for each survey the average percentages 

 of attacked plants in the fields of these two parts, we get the following 

 figures : 



4. The coast districts in the East Riding area have on the whole 

 distinctly lower indices than the inland districts. On dividing the 

 area into a coast region, including districts I, II, III, and X, and an 

 inland region, including districts IV, V, VI, VII, VIII, IX, and XI, and 

 finding the average percentage of attacked plants in the fields of these 

 two regions, we get the following figures : 



