574 
INDEX TO VOLUME X 
Rosa, J. T., Jr. Note on an indirect effect 
of spraying potatoes with Bordeaux 
mixture, 113 
Rubus australis , 532 
Rydberg, P. A. Genera of North Ameri¬ 
can Fabaceae I. Tribe Galegeae, 485 
Saccharomyces anomalus, exiguus , marxian- 
us, estimation of maltose by fermenta¬ 
tion with, 291 
Sagittaria platyphylla , sagittaria , 414 
Salamandra, chromosomes of, 353 
Salicornia australis , 521 
Sands, Harold C. The structure of the 
chromosomes in Tradescantia virginica 
L-» 343 
Santalum cygnorum, 179 
Saxifraga Cryptomorpha, a new section of, 
294 
Saxifraga eriophora, systematic description 
of, 294; nivalis , reflexa , virginiensis, 295 
Scenedesmus, 392 
Schizaea bifida , 53; dichotoma, 41, 519; rupes- 
tris, 55 
Schizomeria ovata, 47 
Sclerotinia sp., 242; cinerea , 256; libertiana, 
249 
Seed-, and pollen-sterility in hybrids, 462 
Seifriz, William. Observations on the 
causes of gregarious flowering in plants, 
93; The gregarious flowering of the or¬ 
chid Dendrobium crumenatum , 32, 107 
Selaginella, foot of, 337; Preissiana, 55; 
uliginosa , 55 
Self- and cross-sterilitv, genetical aspects of, 
468 
Self-pollination, the efficiency of. Studies 
of Lythrum Salicaria I., 440 
Sempervivum, anisophylly in, 279 
Senecio, 521 
Sequoia, cambium of, 501 
Sesban, 486; Sesban , 496 
Sexes, alternation of, and intermittent pro¬ 
duction of fruit in the spider flower 
{Cleome spinosa) , 57 
Sherwood, Everett Clifton. Hydrogen- 
ion concentration as related to the Fusa- 
rium wilt of tomato seedlings, 537 
Shive, J. W. (See R. V. Allison, 554) 
Showalter, Amos M. Studies in the mor¬ 
phology of Riccardia pinguis, 148; The 
chromosomes of Riccardia pinguis , 170 
Shull, George H. The species concept 
from the point of view of a geneticist, 221 
Sideroxylon, 533; myrsinoides, 46 
Sinnott, Edmund W., and George B. 
Durham. A quantitative study of anis¬ 
ophylly in Acer, 278 
Snell, Walter H. The effect of heat upon 
the mycelium of certain structural-timber- 
destroying fungi within wood, 399 
Soil moisture, methods of controlling, 134 
Sophora tetraptera, 522 
Soybeans in artificial culture, studies on the 
relation of aeration and continuous renewal 
of nutrient solution to the growth of, 554; 
in culture solutions, 20 
Sparaxis, 178 
Species concept, the, from the point of view 
of a geneticist, 221, a morphologist, 229, 
a physiologist and bacteriologist, 234, 
a plant pathologist, 239 
Sphaerocarpos, 171; Donnellii, texanus, 
archegonia of, 159 
Sphagnum, 56 
Sphenophyllales, cambium of, 505 
Spirogyra, cell potentialities of, 392 
Spraying potatoes with Bordeaux mixture, 
note on an indirect effect of, 113 
Stakman, E. C. The species concept from 
the point of view of a plant pathologist, 
239 
Stemonitis, life cycle of, 391 
Stenocarpus, 44; sinuatus , 54 
Sterculia foetida, 507 
Sterility in relation to horticulture, 474 
Sterility, seed- and pollen-, in hybrids, 462 
Sterility, self- and cross-, genetical aspects 
of, 468 
Stigeoclonium, amoeboid phase of, 392 
Stout, A. B. Alternation of sexes and in¬ 
termittent production of fruit in the 
spider flower ( Cleome spinosa. ), 57; Studies 
of Ly thrum Salicaria I. The efficiency 
of self-pollination, 440; The physiology 
of incompatibilities, 459 
Strawberry, fertility of, 474; the inheritance 
of flower types and fertility in the, 259; 
sterility in, 474 
Stylidium, 181 
Styphelia, 53 
Suttonia divaricata , 526 
Swainsonia, 533 
Sweet pea, 270 
Sweet potatoes by Rhizopus, the relation of 
the enzym pectinase to infection of, 245 
Symphyogyna, 56, 531 
