11 
which spends its life in proximity to the brown bark of trees will 
be under the influence of the molecular rhythm of such bar! 
possibilities in this idea, in the min the author, that he sup- 
poses “that the ae of the summe we know it now, 
though it has never been par alee in nthe pas will be as noth- 
ing in the blaze of brilliance which s ark the summers of 
the future.” Speculations of this ae are harmless and also 
useless. 
Mr. E, Williams Hervey has recently issued a pamphlet of 
over a hundred pages in which he records a large number of 
original observations on color. As the author in this case says 
in his preface, ‘‘ These (colors) offer a eee novel subject for 
ism, 
find a repetition of well worn observations. Some interesting 
facts in the occurrence of color markings a are peeerece: however. 
nt 
though the logic by which this conclusion is reached rests upon 
facts not conceded by botanists. 
The recent researches of Overton on the red cell-sap of plants 
shows that its occurrence is oe tioned upon the presence of 
tration of the sugar. Low night temperatures induce the de- 
velopment of such colors, which the author believes accounts for 
the reddish eae of alpine species, and to the same cause’ 
are due the wish-red tints of evergreen lea 
winter. If mee of the ordinary ndeetaore ao 
are grown in separate dishes of water containing different propor- 
tions of ee the relation of this substance to color production 
can be ve 
A paper by Miss Grace Smith was read before the Society of 
Plant Morphology and Physiology at New Haven, December 27, 
