580 
INDEX TO VOLUME II 
Notes on the forrtiv: of Castela Galapageia, 
279 
Notholsus mollis, 304 
Nutrient solution for plants, 157; agar, 
449 
Oenothera stenomeres, mutations of, 100 
Oenothera stenomeres mut. gigas, 104; 
108; mut. lasiopetala, loi; 102; f. 
typica, 108 
Opuntia versicolor, daily growth rate of 
roots, 220 
Orcuttia californica, 308 
Osmotic pressure, tables to determine, 
418 
OsTERHOUT, W. J. V. Normal and ab- 
normal permeability, 93 
Palaeobotanical evidence, 4 
Panicularia erecta, 309 
Pappophorum hicolor, 308 
Parasites, genetic relationship of, 116 
Peach, some effects of the brown-rot 
fungus upon the composition of, 71 
Pennisetum glaucum, 300 
Pentoses, utilization of, by Glomerella 
cingulata, 375 
Permeability, normal and abnormal, 93 
Pfitzer, use of picro-nigrosin, 89 
Phanerophytes, 24 
Photosynthesis at low temperatures, 37; 
in winter, 64 
Phylogenetic evidence, 10; conclusions, 
18 
Phylogeny of Angiosperms, i 
Pinus, leaves in winter, temperature of, 
32 
Picro-nigrosin, 89 
PiETERS, Adrian J. The relation be- 
tween vegetative vigor and repro- 
duction in some Saprolegniaceae, 529 
Plus and minus strains, 449 
Poa Merrillana, 309; Wrightii, 309 
Podomitrium Malaccense, 199; 200 
Podomitrium, morphology and syste- 
matic position of, 199 
Pool, Raymond J. A brief sketch of 
the life and work of Charles Edwin 
Bessey, 505 
Potassium chloride, experiments with, 
275; dihydrogen phosphate, 273; ni- 
trate, 270, 312, 320; sulphate, 272 
Precision auxanometer, 95 
Preliminary note on the morphology of 
Gnetum, 161 
Prosopis velutina, daily growth rates of 
roots, 220; hourly growth rate of 
roots, 221 
Puccinia Rhamni, urediniospores of, 
82, 83, 84 
Pycnospores of chestnut blight fungus, 
162 
Pyronema confluens var. inigeum, de- 
velopment of, 289 
Raunkiaer, system of temperature fac- 
tors, 23 
Relationships, genetic, experimental 
study of, 132 
Relationships, morphology as a factor 
in determining, 1 1 1 
Relationship of parasites, 116 
Reproduction, in some Saprolegniaceae, 
529 
Reversions of Angiosperms, 9 
Root-growth, on the relation of, to the 
temperature and aeration of the soil, 
211 
Roots, absorption of ions by, 250 
Rytilix granularis, 299 
Saprolegnia ferax, 545; monoica, 557 
Saprolegniaceae, the relation between 
vegetative vigor and reproduction in 
some, 529 
Sderotinia cinerea, cause of brown-rot 
of peach, 71 
Seed sterilization, by calcium hypo- 
chlorite, 420; historical summary of 
methods, 420 
Seedling of Angiosperms, 8 
Setaria italica and its immediate allies, 
a taxonomic study of, 169 
Setaria italica subsp. stramineofructa, 
