454 
INDEX TO VOLUME VI 
Endrot fungus, effect of, on cranberries, 235 
Ensign, M. R, Venation and senescence 
of polyembryonic citrus plants, 311 
Evolutionary status of polycotyledony, 106 
Farlow, W. G., Thaxter, R., and Bailey, 
L. H. George Francis Atkinson, 301 
FiTZPATRiCK, Harry, M. Publications of 
George Francis Atkinson, 303 
Funaria hygrometrica, gametophyte and 
sexual characters in, 387 
Fusicoccum putrefaciens, endrot fungus on 
cranberries, 235 
Galls on Ambrosia trifida, 34 
Gametophyte of Funaria, 387 
Germination and further development of 
the embryo of Zea Mays separated from 
the endosperm, 443 
Gray, John, and Peirce, G. J. The 
influence of light upon the action of 
stomata and its relation to the trans- 
piration of certain grains, 131 
Growth and variability in Helianthus, 252 
Hardiness in peach buds, 373 
Harper, R. A. The structure of proto- 
plasm, 273 
Hayden, Ada. The ecologic foliar anat- 
omy of some plants of a prairie province in 
central Iowa, 69; The ecologic subter- 
ranean anatomy of some plants of a 
prairie province in central Iowa, 87 
Helianthus, growth and variability in, 252 
Influence of light upon the action of stomata 
and its relation to the transpiration of 
certain grains, 131 
Influence of phosphates on the action of 
alpha-crotonic acid on plants, 107 
Influence of sugars on the growth of albino 
plants, 401 
Inheritance of sex in Mercurialis annua, 410 
Iowa, ecologic study of prairie plants of, 
69, 87 
ohnston, Earl S. An index of hardiness 
in peach buds, 373 
Knudson, L. Viability of detached root- 
cap cells, 309; and Lindstrom, E. W. 
Influence of sugars on the growth of albino 
lants, 401 
Larix, cotyledons in, 114 
Light, action of, on stomata, 131 
Lindstrom, E. W. (See Knudson, L., 401) 
Lloyd, Francis E. The origin and nature 
of the mucilage in the cacti and in certain 
other plants, 156 
Lutman, B. F. Osmotic pressures in the 
potato plant at various stages of growth, 
181 
Mercurialis annua, inheritance of sex in, 410 
Mitochondria in Preissia and corn, 217 
Morse, Fred W. (See Stevens, Neil E., 
235) 
Mucilage, in cacti and other plants, 156 
Nucleo-cytoplasmic ratio, in Citrus grandis, 
373 
Opuntia, mucilage in, 156 
Origin and nature of the mucilage in the 
cacti and in certain other plants, 156 
Osmotic pressures in the potato plant at 
various stages of growth, 181 
Oxy coccus macrocarpus, endrot fungus on, 
235 
Papaipema galls on Ambrosia, 34 
Pathologic conditions in Ambrosia trifida, 34 
Peach buds, index of hardiness in, 373 
Peirce, George J. (See Gray, John, 131) 
Phosphates, influence of, on the action of 
alpha-crotonic acid on plants, 167 
Picea Mariana, cotyledons in, no, 114 
Pigments of Endothia, 242 
Pinus Banksiana, cotyledonary fusion in, 
108; Laricio, cotyledons in, 114 
Plastids and mitochondria in Preissia and 
corn, 217 
Pleurage curvicolla, variations in, 406 
Polycotyledony, evolutionary status of, 106, 
Polyembryonic Citrus plants, 311 
Potato, osmotic pressures in, 181 
Prairie, ecologic study of plants of Iowa, 
69,87 
Preissia, plastids and mitochondria in, 217 
Protomyces andinus gall on Ambrosia 
trifida, 34 
Protoplasm, structure of, 273 
Ramaley, Francis. The role of sedges in 
some Colorado plant communities, 120 
Reed, H. S, Growth and variability in 
Helianthus, 252 
