58o 
INDEX TO VOLUME IX 
Plantago major, viability of seeds in, 268 
Plenodomus fiiscomaculans, 461 
Pluteus admirahilis, development of, 512 
Pollination of Marcgravia, the: a classical 
case of ornithophily?, 370 
Polyembryony, 213 
Polygonum hydropiper, viability of seeds 
in, 268 
Polyporus hispidus, on ash, 506 
Poly stigma riihrum, temperatures of leaves 
affected by, 388 
Poplar, Fomes igjiiarius on, 506 
Portulaca oleracea, viability of seeds in, 268 
Potato, injury from free/ing in storage, 555; 
ovules with two embryo sacs, 213 
Prairie inclusions in the deciduous forest 
climax, 330 
Preissia, 288 
Puccinia Asparagi, susceptibility of onions 
to, 196; Caryophylli, artificial infection 
with, 188; coronata, 193; coronifera, 218, 
on oats, 190; dispersa, 187; glumarum, 
resistance to, in wheat, 186; graminis 
on barberry and wheat, 199; graminis 
avenae on oats, 197; graminis tritici on 
wheat seedlings, 188; malvacearum on 
AltJiea rosea, 195; poculiformis , 201; 
rubigo-vera on rye, 198; secalina, 218; 
Scrghi, 218, on Zea Mays, 190; triiicina, 
199, 218 
Pulling, Howard E. Biophysics as a 
point of view in plant physiology, 37 
Radish, respiration in, 277; roots, effect of 
increased nitrates upon growth of, 438 
Raines, M. A. Vegetative vigor of the 
host as a factor influencing susceptibility 
and resistance to certain rust diseases 
of the higher plants I, 183; II, 215 
Rankin, E. J. (See W. E. Tottingham, 270) 
Reboiilia Charrieri, 286; hemisphaerica, the 
male receptacle and antheridium of, 285; 
occidentalis, 286 
Reduction divisions in the pollen mother 
cells of Oenothera franciscana, the, 391 
Relations between root development and 
tillering in wheat, certain: significance 
in the production of high-protein wheat, 
366 
Resistance and susceptibility to certain 
rust diseases of the higher plants, vegeta- 
tive vigor of the host as a factor influ- 
encing, 183; 215 
Respiration, comparative studies on XXI. 
Acid formation and decreased production 
of CO2 due to ethyl alcohol, 277; XXII. 
The effect of lactic acid on the respi- 
ration of wheat, 307 
Rhamnus cathartica, 199 
Rhizoctonia solani, 464 
Rhizopus nigricans, 462 ; on strawberries, 
204 
Ribes, resistance and susceptibility to in- 
fection by Cronartium ribicola, 197 
Robinia Pseudo- Acacia, white heart-rot of, 
493 
Root cells of Salix nigra Marsh., the re- 
lation of age to size in certain, 121 
Root growth in seed plants, studies of the 
mechanism of the physiological effects 
of certain mineral salts in altering the 
ratio of top growth to, 415 
Roots of corn, with plumule and endo- 
sperm removed but with cotyledon 
attached, effect of increased nitrates 
upon growth of, 439; radish, efifect 
of increased nitrates upon growth of, 438 
Rumex crispus, viability of seeds in, 268 
Rust diseases of the higher plants, vegeta- 
tive vigor of the host as a factor influ- 
encing susceptibility and resistance to 
certain, 183; 215 
Ruth, W. A. The effect of Bordeaux mix- 
ture upon the chlorophyll content of the 
primordial leaves of the common bean, 
Phaseolus vulgaris L., 535 
Ruyschia, nectaries of, 371 
Salix nigra Marsh., the relation of age to 
size in certain root cells and in vein-islets 
of the leaves of, 121 
Salts, the growth of field corn as affected 
by iron and aluminum, 47 
Salvia, respiration in, 277 
Schaffner, John H., Control of the sexual 
state in Arisaema triphyllum and Ari- 
saema Dracontium, 72 
Schizophyllum commune, development of, 
513 
Sclerotinia cinerea, 464; liber liana, 464 
Scolopendrium in New York State, the 
present status of, 28; vulgare, 28 
Scrophulariaceae, stigmas of, 119 
Seed plants, studies of the mechanism of 
the physiological effects of certain mineral 
salts in altering the ratio of top growth 
to root growth in, 415 
