1918] SINNOTT—FOOD RESERVE 175 
4. This suggests that differences in the type of food reserve may 
be due to (1) differences in water content of the various storage cells, 
resulting in modification of enzyme activity, or (2) differences 
in the ease with which enzymes have effective access to the storage 
cells. 
The writer wishes to thank the authorities of the Agricultural 
Experiment Stations of Louisiana and of Florida for material from 
their states, and the authorities of the Arnold Arboretum for speci- 
mens from their extensive collections of trees and shrubs. For 
several helpful suggestions he is also indebted to Professor W. J. V. 
OsTERHOUT of Harvard University. 
CONNECTICUT AGRICULTURAL COLLEGE 
SToRRS, CONN. 
LITERATURE CITED 
eal 
- Faprictus, L., Untersuchungen iiber den Starke- und Fettgehalt der Fichte 
auf den oberbayerischen Hochebene. Naturw. Zeit. Land. u. Forstw. 3: 
137. 1905. 
- Fiscuer, A., Beitrige zur Physiologie der Holzgewichse. Pringsheim’s 
Jahrb. 22:73. 1890. 
- NIKLEWSKI, B., Untersuchungen iiber die Umwandlung einiger stickstof- 
freier Reservestoffe wahrend der Winterperiode der Baume. Beih. Bot. 
Centralbl. 19:68. 1906. 
4. PREsTON, J. F., and Purtuips, F. J., Seasonal variation in the food reserve 
of trees. Roient ay 9: aga: sede 
- SABLON, DU, LECLERC, R i les mati d 
des arbres. Rev. Gen: Botanique 16: 386. 1 
mueo2, J. .4,, Oel als Reservestoff der Scie: Beih. Bot. Centralbl. 
1:1891. 
N 
w 
on 
- 
