382 



Journal of Agricultural Research 



Vol. XV. No. 7 



Table I. — Carbohydrates in healthy and in blighted spinach 



The starch content of the diseased tops is somewhat more than double 

 that of the normal material. In the roots, both total sugars and starch 

 were practically alike in both types of material. 



From these results it appears justifiable to conclude that the cause of 

 injury does not affect the machinery of photosynthesis or the materials 

 used in carbohydrate manufacture to such an extent as to stop produc- 

 tion. That this is carried on with equal efficiency in all parts, or with 

 normal efficiency even in any part of the leaf, however, can not be stated. 

 Indeed, the yellowish-green color representing an apparent reduction of 

 chlorophyll would seem likely to go with a decreased activity in the 



