INDEX TO VOLUME VII 
(New names and final members of ne 
Abietineae, polyembryony in, 128 
Absorption of moisture by gelatin in a 
saturated atmosphere, 318 
Acer saccharum, effect of ringing on, 113, 289 
Age-annual rings, 363 
Agave americana, sexual periodicity in, 83 
Aleurodiscus, biology, morphology, and 
cytoplasmic structure of, 445 
Allium canadense, 399; Cepa, 390, 398; 
cernuum, 399; periodicity in rate of 
growth of cells of, 390 
Anatomy of Chenopodium album, 252 
Angiosperms, size variations of cambial 
initials in, 355 
Apricot trees, growth in pruned and un- 
pruned, 328 
Araucaria, phylogeny of, 134, 165 
Artschwager, Ernst F. On the anatomy 
of Chenopodium album, 252 
Ascobolus immersus, spore discharge of, 75 
Ascomycetes, morphology and life history 
of, 435 
Baas Becking, L. G. M., and H. C. 
Hampton. Measurement of the cata- 
lytic power of catalase, 261 
Bailey, I. W. The cambium and its 
derivative tissues. II. Size variations 
of cambial initials in gymnosperms and 
angiosperms, 355; III. A reconnaissance 
of cytological phenomena in the cam- 
bium, 417 
Bamboo, length of life cycle, 83; sexual 
periodicity in, 83 
Banta, a. M. Sex intergrades in Daph- 
nia, 22. (See C. Yampolsky, 21) 
Bennettitales, 146 
Blakeslee, a. F., Roland Thaxter, and 
William Trelease. William Gilson Far- 
low, December 17, 1844-June 3, 1919, 173 
Bryan, George S. Early stages in de- 
velopment of sporophyte of Sphagnum 
subsecundum, 296; fusion of ventral canal 
cell and egg in Sphagnum subsecundum, 
223 
combinations are in heavy face type.) 
Bryophyllum, freezing and development of 
color in, 216 
BucHHOLZ, John T. Embryo development 
and polyembryony in relation to the 
phylogeny of conifers, 125 
BuLLER, A. H. R., 75, 77. (See J. L. 
Weimer, 75) 
Cambium, cytological phenomena in, 417; 
derivative tissues, 355, 417; karyokinesis 
in, 421; nucleoH in, 428; size variations 
of cambial initials in gymnosperms and 
angiosperms, 355 
Cambium and cytokinesis, 424, 426 
Carbon dioxide, an apparatus for deter- 
mining small amounts of, 368 
Catalase, relation of concentration to for- 
mation of over-growths in, 211; measure- 
ment of catalytic power of, 261 
Catalytic power, measurement of, in cata- 
lase, 261 
Cell division in roots, 380; periodicity of, 380 
Cell plate, types of, in higher plants, 425 
Celtis, early stages of Pachypsylla galls on^ 
275 
Ceratozamia, size of spores of, 163 
Cercospora Bolleana, 436 
Cereals, longevity of seeds of, 243 
Chamberlain, Charles J. The living 
cycads and the phylogeny of seed plants, 
146 
Chemicals, injection of, into chestnut trees, i 
Chenopodium album, anatomy of, 252 
Chestnut bark disease, i 
Chestnut trees, injection of chemicals into, i 
Chestnuts, effect of substances injected into 
trunks, 45 
Chromosomes, somatic, in Tradescantia, 341 
Chusquea abietijolia, sexual periodicity in, 83 
Clover, longevity of seeds of, 243 
Codonotheca, size of spores of, 163 
Codonotheca caduca, 163 
Colorado, subalpine lake-shore vegetation 
in north-central, 57 
Coniferales, embryogeny of, 125 
