468 
INDEX TO VOLUME VII 
Rhythms, daily, of elongation and cell 
division in certain roots, 380 
Sando, Charles E. (See J. Rosenbaum, 
78)^ 
Secretion of invertase by plant roots, 371 
Seed ferns, relationships of, 162 
Seed plants, phylogeny of, 146, 158 
Seifriz, William. The length of the life 
cycle of a climbing bamboo. A striking 
case of sexual periodicity in Chusquea 
ahietifolia Griseb., 83 
Sex forms in plants, distribution of, accord- 
ing to Engler and Gilg, 33 
Sex intergradation in flowers of Mercurialis 
annua, 95; occurrence and inheritance of, 
in plants, 21 
Sharp, Lester W. Somatic chromosomes 
in Tradescantia, 341 
Shezyrez, Ivan. (See C. Rumbold, i) 
Shull, Charles A., and S. P. Shull. 
Absorption of moisture by gelatin in a 
saturated atmosphere, 318 
Shull, S. P. (See Charles A. Shull, 318) 
SiFTON, H. B. Longevity of the seeds of 
cereals, clovers, and timothy, 243 
Smith, Erwin F. (See R. B. Harvey, 211) 
Somatic chromosomes in Tradescantia, 341 
Spermatia, presence and function of, in 
Ascomycetes, 435 
Species introduced into North Dakota, 
237; of Plantago in Hawaii, 210 
Sphaerella BoUeana, 436 (text fig. i, 
437, text fig. 2, 439, pi. XXX) 
Sphaerocarpos Donnellii, development of 
the thallus of, 182 
Sphagnum subsecundum, early stages in 
the development of sporophytes of, 296; 
fusion of ventral canal cell and egg in, 223 
Spore discharge of Pleurage curvicolla, 75 
Spores, germination of, in Conocephalum 
conicum, 458 
Sporophyte, early stages in development of, 
in Sphagnum subsecundum, 296 
Stephenanospermum, size of spores of, 163 
Stevens, F. L., L. H. Pammel, and Mel 
T. Cook. Byron David Halsted, June 7, 
1852-August 28, 1918, 305 
Stevens, O. A. The geographical dis- 
tribution of North Dakota plants, 231 
Stork, H. E, Biology, morphology, and 
cytoplasmic structure of Aleurodiscus, 445 
Successions, plant, 72 
Temperature, automatically changing of, 39 
Thallus, development of, in Sphaerocarpus 
Donnellii Aust., 182 
Thaxter, Roland. (See A. F. Blakeslee, 
173) 
Timothy, longevity of seeds of, 243 
Tradescantia, somatic chromosomes in, 341 
Translocation of foods in woody plants 
upward, loi; tissues concerned in, lOi 
Trelease, William. (See A. F. Blakeslee, 
173) 
Variations, size, of cambial initials in 
gymnosperms and angiosperms, 355 
Vegetation, subalpine lake-shore, in north- 
central Colorado, 57 
Ventral canal cell, fusion of, with egg in 
Sphagnum subsecundum, 223 
Vicia faba, periodicity in rate of growth of 
cells of, 399 
Weimer, J. L. Some observations on the 
spore discharge of Pleurage curvicolla 
(Wint.) Kuntze, 75 
Wells, B. W. Early stages in the develop- 
ment of certain Pachypsylla galls on 
Celtis, 275 
Wheat, longevity of seeds of, 243 
WiELAND, G. R., 148, distribution and 
relationship of the cycadeoids, 154 
Williamsoniella coronata, 155 
Wood preservation, 2 
Wright, R. C. An apparatus for deter- 
mining small amounts of carbon dioxide, 
368 
Yampolsky, Cecil. Occurrence and inheri- 
tance of sex intergradation in plants, 21; 
sex intergradation in the flowers of 
Mercurialis annua, 95 
Zea everta, periodicity in rate of growth of 
cells of, 392, 398 
Zea Mays, experiments on secretion of 
invertase by roots of, 374 
Zirkel, Conway. (See Ivey F. Lewis, 333) 
Zonation, types of, 62, 234 
