W. A, Davis, A. J. Daish and G. C. Sawver 2<S9 



which agrees very closely with that found in Series II. After these 

 maxima have been reached (probably as in the August picking, owing 

 to certain reserve substances, such as gums, being put under contri- 

 bution), the sugars continue to fall at almost parallel rates and along 

 practically straight lines until just after sunrise. 



Day 



9am 11 1pm3 5 7 9 11 1am 3 5 



Fig. 6. Mangold leaves, Series III, Oct. 11-12, 1912. 



It IS a striking fact that the two maxima for the total sugars (C and 

 C") at night correspond with roughly the same proportion of sugars 

 (about 21 per cent, of the total vacuum-dried matter) ; the same was true 

 of the two night maxima of Series II, but here the value for the total 



20—2 



