59 



They were all submitted to a more or less detailed analysis, notes being 

 taken of the number of submain veins from the midrib running to points 

 on the margin, of the mites present or absent in the corresponding axillary 

 buds and of the character of the leaf margins (Table II). 



Cases 1-6 were mite free, where examined for mite, with the exception 

 of one bud in case 4, which for the moment may be regarded as negligible. 

 Cases 7-11 were all affected with mite. 



Case 1. This was a perfectly normal shoot. The seven first formed, 

 leaves, namely the basal ones, had seven submain veins, the next two 

 six and then came a series of fives followed by three sixes. This shoot 

 was examined on June 29th and had therefore by no means finished its 

 growth. Graph 1 brings out the essential points more clearly. The drop 

 from seven to five occurred largely during the month of June and possibly 

 also during the end of May. This period, to judge by other growth graphs 

 formed for apples and pears, constitutes the period of maximum growth. 

 Now if, as previously indicated, a reduction of leaf veins occurs when the 



