Table IV. —Observations on late-flowering cosmos , showing: (i4) the effectiveness of low-intensity electric light as a supplement to daylight in estab¬ 
lishing the high hydrogen-ion concentration of the cell sap which is associated with the advanced vegetative condition , and ( B ) the rise in hydrogen-ion 
concentration of the upper parts of the plant in the return from the flowering to the vegetative condition ( rejuvenescence ) which results from exposure 
to increased length of day 
136 
Journal of Agricultural Research 
Vol. xxvn. No. 3 
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