1896.} Anatomical and Physiological Researches. 163 
quantity of reserves present and the concentration of the waste 
products belong to the former class of stimuli. The chemi- 
cal nature, the food value of the substance and the mass of- 
fered are of the latter class. 
Generally speaking, the better food is taken before the 
poorer, it being kept in mind that the individual peculiarities 
of the plant determine what constitutes a substance a good ora 
poor food. The extreme diversity as regards the chemical na- 
ture of substances used to supply the carbon demand is cited. 
In order to speak more precisely concerning the values of 
materials used as food, Pfeffer introduces the ‘‘economic co- 
efficient” of a substance for any plant in question. The 
“economic coefficient” of any substance for a given fungus is 
the amount of the dried fungus mass produced from the con- 
sumption of 100 parts of the food material. 
The coefficients of dextrose and glycerine for the two kinds 
of fungi most used are as follows: 
Dextrose. Glycerine. 
ree @) 
Aspergillus MEMO mek 
Penicillium glaucum . . bo: SAS wri ie 
RopneEy H. TRUE. 
On the Prevailing ombrophilous character of the foliage 
of tropical plants.! 
_ A review of Wiesner’s preliminary studies upon this subject 
in Europe was given in this journal in March, 1895. The 
Present paper contains the results of his observations in Buit- 
‘nzorg. It was proved, according to his previous experi- 
ments, that a distinction can be made between ‘‘ombrophobic 
and “‘ombrophilous” foliage, and it was to be expected that 
this last form, the ombrophilous, would be the prevailing one 
in the moist tropical climate of Java. 
The observations of Professor Wiesner show now, that the 
de 
Mate in this place. This is further illustrated by the fact 
a 
Wiesner Jo : ee Buitenzorg. III: Ueber 
» JULIUS: Pflanzenphysiol. Mittheilungen aus bul 
gat Yorherrschend ombrophilen Charakter des Laubes der hg a gen 
@sber. d. K. Akad. d. Wiss. math.-naturwiss. Classe 103: 169-191. 1894. 
