298 The Carhohydratis of the Maiujohl Leaf 



3. The values of 7? in the hist column, giving the percentage of 

 total sugars in the matter extracted by alcohol, show that as the season 

 advances the sugars form a larger and larger proportion of the total 

 soluble matter which is conveyed by the stalks and mid-ribs. In 



6 AM. 12 Noon 6 P.M. 12Nishl 



Fig. 8. Mangold stalks, bottoms. Series I, Aug. 26-27, 1913. 



6am 



Series I, August 26th, the values of U range from 17-2 to29-6 per cent. ; 

 whereas in September and October the sugars formed 40 to 50 per cent, 

 of the total matter soluble in alcohol. The proportion of sugars in this 

 dry matter is at a minimum early in the morning (6 a.m.) and at a 



