106 BOTANICAL GAZETTE [Aveust 
in field laboratories of fundamental plant-dynamics, that ecologica 
knowledge can really be advanced. And the dynamical problems, 
as I see them, fall under these heads, in the order of importance 
(a) physiological life-histories of species, (b) physics and chemistry — 
of the soil, (c) nature of plant-competition, (d) a better correlation — 
of meteorological data with physiological phenomena. : 
SMITH COLLEGE, 
Northampton, Mass. 
