5:i 



the season. The tvyo graphs have the sarae general direction 

 of slope excepting between the periods beginning July 15 and 

 July 31. For Ghews"ille the height graph exiaibits the sarie f?en-. 

 eral direction of slope as does the leaf-product graph from 

 period to period, throughout the season, and the former lies 

 v,'ell above the latter for the last 4 periods (beginning Aug. 25, 

 3ept.ti, iSept. S2 and Oct. 7j. r'cr the periods beginning June 16 

 and June 30 the aame relation holds, although the index values 

 are large, especially in the case of ths first of these tv/o 

 periods. For Lonrovia the two plant graphs follow each other 

 very closely throughout the entire season. The graphs for 

 College, for the periods begirjiing July 13, July 17 and July 31 

 illustrate ^he teniency c "'^ the height value ' decrease rela- 

 tively to those of leaf-product 7:h.en both values are large. 

 7or the periods beginning Sept. 10, Sept. 25 and Got. 10 fOr 

 this station, no.v ver, both v;-.' _ \r e small and still the 

 height lies above the other, and for the period beginning 

 June 19 the relation between the two graphs is reversed, al- 

 though both values are relatively high. For Baltimore, the 

 periods beginning June 10, July 23 and Aug. 20 exhibit exceptions 

 to the proposition thiit the height graph should lie below the 

 graph of le af -product when both plant values nxi^ Large. The 

 generalization is true, however, for the period beginning 

 Aug. 6, in which case the values are both lars-e anl the leaf^^ 

 product graph lies well above the other, i'or ijariington the 

 two graphs agree very v/ell in form throughout the season, ex- 

 cept for the period beglnnirig July 10 in which case' the gen- 

 eralization holds and, .vi th both plait values high, the one for 

 height is considerably lower than t' : ar. For 3cleman the 



