INDEX TO VOLUME IX 
581 
Seed- viability experiment, Dr. W. J. Beal's, 
266 
Selaginella Kraussiana, 77 
Septoria A pit, on celery plants, 233 
Seshania aculeata, floating roots of, 123 
Sexual state, in Arisaema triphyllum and 
Arisaema Dracontium, control of the, 72 
Smith, Edith Philip. Comparative stud- 
ies on respiration XXII. The effect of 
lactic acid on the respiration of wheat, 307 
Solatium tuberosum, polyembryony in, 213 
Souroubea, 372 
Sphaeropsis malorum, 464 
Spirogyra, a new species of, with unusual 
arrangement of the chromatophores, 283; 
cell wall of, 18; crassa, 283; rectispira, de- 
scription of, 284 
Sponsler, O. L. The structure of the 
starch grain, 471 
Starch grain, the structure of the, 471 
Sterigmatocystis violae, 464 
Stevens, Neil E. Rots of early straw- 
berries in Florida and southern California, 
204; environmental temperatures of fungi 
in nature, 385 
Stigmas, significance of the behavior of 
sensitive, 99 
Strawberries, rots of early, in Florida and 
southern California, 204; temperatures of, 
387 
Strongylocentrotus purpuratus, 282 
Susceptibility and resistance to certain rust 
diseases of the higher plants, vegetative 
vigor of the host as a factor influencing, 
183; 215 
Synthetic culture media, growth of some 
parasitic fungi in, 459 
Syringa, rot of, 501 
Tecoma radicans, stigma of, 100 
Tellefsen, Marjorie a. The relation 
of age to size in certain root cells and in 
vein-islets of the leaves of Salix nigra 
Marsh., 121 
Temperature, low-, storage and freezing 
on fruits and vegetables, the effect of, 
551; relations to disease virulence, 192 
Torenia fournieri, stigma of, 100 
ToTTiNGHAM, W. E., and E. J. Rankin. 
Nutrient solutions for wheat, 270 
Trametes robiniophila, a study of the white 
heart-rot of locust caused by, 493 
Transpiration, the effect of, on the absorp- 
tion of salts by plants, 311 
Trauma in relation to susceptibility to 
disease, 195 
Trelease, Sam F., Incipient drying and 
wilting as indicated by movements of co- 
conut pinnae, 253 
Trifolium re pens, viability of seeds in, 268 
Triticum. species of, 199 
Tubaria furfuracea, development of, 513 
Turner, Thomas Wyatt. Studies of the 
mechanism of the physiological effects 
of certain mineral salts in altering the 
ratio of top growth to root growth in 
seed plants, 415 
Undercooling of peach buds, 93 
Uphof, J. C. Th. Ecological relations of 
plants in southeastern Missouri, i 
Uromyces caryophyllinus, 238 
Utricularia vulgaris, stigma of, 100 
Variation, regressive, or reversion from the 
primary and secondary sports of Ne- 
phrolepis exaltata var. bostoniensis, 140 
Vaucheria, healing in, 19 
Vein-islets of the leaves of Salix nigra 
Marsh., the relation of age to size in, 121 
Verbascum thapsus, viability of seeds in, 268 
Vermicularia sp., 464 
Viability of seeds, 266 
Vitis vulpina, vein-islets in the leaves of, 121 
Water relations to disease virulence, 191 
Weinstein, Margaret. (See Marian Irwin, 
277) 
Wheat, certain relations between root 
development and tillering in: significance 
in the production of high-protein wheat, 
366; nutrient solutions for, 270; respi- 
ration of, 307; scab, hydrogen-ion con- 
centration in its relation to, 159; seed- 
lings in nutrient solutions, 180 
Wilson, Carl L. Lignification of mature 
phloem in herbaceous types, 239 
Young, H. C, and C. W. Bennett. Growth 
of some parasitic fungi in synthetic 
culture media, 459 
Young, W. J. Potato ovules with two 
embryo sacs, 213 
Yuncker, T. G. Revision of the South 
American species of Cuscuta I, 557 
Zea Mays, growth of, 47-71 ; Puccinia Sorghi 
on, 190, 219; roots of, 123 
