INDEX TO VOLUME IX 
(New names and final members of new 
Actinomyces and hydrogen-ion concen- 
tration, i6o 
Agaricus, development of: arvensis, 512; 
campestris, 509; comtulus, 512; melleus, 
510; Rodmani, ^12; tabularis, tempera- 
tures for growth of, 388 
Age and maturity of host tissue in relation 
to virulence of disease, 196 
Agropyron, susceptibility of, to disease, 196 
Agrostis alba, susceptibility of, to disease, 
197 
Algal cells, methods of healing in some, 18 
Alsine media, viability of seeds in, 268 
Alternaria hrassicae, 459 
Althea rosea, Puccinia malvacearum on, 195 
Aluminum and iron salts, the growth of 
field corn as affected by, 47 
Amanitopsis vaginata, development of the 
carpophore of, 511 
Amaranthus graecizans, viability of seeds 
in, 268; retroflexus, viability of seeds in, 
268 
Ambrosia elatior, viability of seeds in, 268 
Anthemis cotula, viability of seeds in, 268 
Apples, freezing of, in storage, 555 
Arenga saccharifera, 82 
Arisaema triphyllum and Arisaema Dracon- 
tium, control of the sexual state in, 72 
Armillaria (mellea), 510 
Arndt, Charles Homer. The growth of 
field corn as affected by iron and alu- 
minum salts, 47 
Ascochyta pisi, 464 
Ash, Fomes fraxinophilus on, 506; Poly- 
porus hispidus on, 506 
Asparagus rust, 194 
Aspergillus niger, 459; and hydrogen-ion 
concentration, 159 
A vena saliva, 199 
Bailey, Irving W. The pollination of 
Marcgravia: a classical case of orni- 
thophily?, 370 
Barley, top and root growth of, 423 
Bartlett, H. H. (See Carl D. La Rue, 
79, and Peter J. Klaphaak, 446) 
combinations are in heavy-face type.) 
Beal's, Dr. W. J., seed-viability experiment, 
266 
Benedict, R. C. The origin of new varie- 
ties of Nephrolepis by orthogenetic 
saltation II. Regressive variation or 
reversion from the primary and second- 
ary sports of bostoniensis, 140 
Bennett, C. W. (See H. C. Young, 459) 
Berberis vulgaris, 199 
Bergman, H. F. Observations on the 
effect of water-raking on the keeping 
quality of cranberries, 245 
Betel-nut palm, leaf spot of, 85 
Bignoniaceae, stigmas of, 120 
Biophysics as a point of view in plant 
physiology, 37 
Birch twigs, temperatures of, 389 
Blackberry canes, temperatures of, 387 
Bonns, Walter W. A preliminary study 
of Claviceps purpurea in culture, 339 
Bordeaux mixture, the effect of, upon the 
chlorophyll content of the primordial 
leaves of the common bean, Phaseolus 
vulgaris L., 535 
Bornetia secundiflora, healing in, 18 
Botryosphaeria ribis, 386 
Botrytis allii, 464; cifierea and hydrogen-ion 
concentration, 161; cinerea on straw- 
berries, 204 
Brassica nigra, viability of seeds in, 268 
Bremia lactucae on lettuce, 233 
Bromus secalinus, 187; viability of seeds in, 
268 
Bursa bursa-pastoris, viability of seeds in, 
268 
Caeoma abietis-canadensis , origin of pycnia 
of , 363 
Calvatia cyathiformis, temperatures for 
growth of, 388 
Cannabis saliva, sex in, 78 
Caracasia, nectaries of, 371 
Carbohydrates, effect of, on root growth, 
442 
Carbon metabolism of the host, 189 
Carnation rust, 194 
