INDEX 
Page 
Accumulation of Aluminum and Iron Com¬ 
pounds in Com plants and Its Probable 
Relation to Rootrots: G. N. Hoffer and R. 
H. Carr.801-824 
Acidity— 
soil, relation to absorption of iron and 
aluminum by plants.803,804,819,821 
wheat sap, relation to disease resistance of 
varieties. 373“386 
Adds, hydrochloric, nitric, sulphuric, effect 
on growing wheat. 57-63 
Manns, Thomas P. and Adams, J. F.: Para¬ 
sitic Fungi Internal of Seed com.495-524 
Aeration, effect on— 
growth of Azobacter. 665-667 
nitrogen fixation. .....668-669 
After-Ripening and Germination of Apple 
Seeds: George T. Harrington and Bertha 
C. Hite. 153-162 
A gamer mis decaudata Cobb, Steiner, and 
Christie: A Nema Parasite of Grasshoppers 
and other Insects: N. A. Cobb, G. Steiner, 
and J. M. R. Christie.921-926 
A gamer mis decaudata f life history and descrip¬ 
tion. 923-926 
Alabama, Musde Shoals, experiments with 
borax fertilizers for cotton... 433.438-442 
Alkaloids, Bikukulla spp. 71-76 
Allard, H. A., and Gamer, W. W.: Further 
Studies in Photoperiodism, the Response 
of the Plant to Relative Length of Day and 
Night.871-920 
Allen, Ruth F.: A Cytological Study of 
Infection of Baart and Kanred Wheats by 
Puccinia grammis tritici . 131-152 
Allison, F. E., and Skinner, J. J.: Influence of 
Fertilizers Containing Borax on the Growth 
and Fruiting of Cotton.433-444 
Al uminum — 
compounds accumulation in com plants, 
relation to rootrots.801-824 
plant, occurrence and distribution.802-806 
salts— 
accumulation in tissues of com plants, 
effects.814-818 
in soil, availability and relation to acid¬ 
ity.804,814,819 
solutions, injection into com plants, 
experiments.810-813 
Amaranthus, growing experiments with day¬ 
light of different lengths. 873 
Ammonium salts, effects on wheat at different 
stages of growth. 57-62 
Analyses, Azotobacter cultures.667-669 
Anatomical Studies on Potato-Wart: Ernst 
F. Artschwager.963-968 
Anthelmintic, tests of carbon tetrachlorid.. 163-192 
Aphis— 
maidis, carrier of mosaic disease. 281-283 
pomi — 
development, influence of temperature 
and evaporation. 969-987 
life history. 97 ° 
Aplastomorpha vandinei, description and life 
history. 550"555 
Aplastomorpha vandinei Tucker, and impor¬ 
tant parasite of Sitophilus oryza L.: Richard 
T. Cotton. 549-556 
Apogeotropism, plant, relation to length of 
day. 886-889 
Apple- 
growth, relation to length of daylight. 888 
seeds—after-ripening and germination... 153-165 
respiration. 117-130 
Arizona— 
cotton irrigation experiments. 927-946 
cotton rootrot. 525-527 
Page 
Arlington Experiment Farm, experiments 
with borax fertilizers for cotton.433,434-437 
Arrowhead, growing, experiments with day¬ 
light of different lengths. 878,9T2 
Artichoke, growing, experiments with day¬ 
light of different lengths.895-896,897 
Artschwager, Ernst F.: Anatomical Studies 
on Potato Wart.963,968 
Ascarids, control by carbon tetrachlorid. 164-187,189 
Azotobacter— 
cell forms, reproduction, regeneration, and 
conjunction.401-414 
cultures, analyses.667-669 
and media used.666-667 
dried, as source of vitamin B., feeding ex¬ 
periments. 828-830 
dwarfed growth, description and compari¬ 
sons. 4x7-419 
growth-promoting substance production. 825-83 x 
growth, stimulating by aeration.665-667 
growth types, comparison with other bac¬ 
teria. 4x4-425 
life-history studies.401-432 
studies, literature, citations. 677 
Baart wheat, susceptibility to stem rust, 
cytological studies. 139-145 
Bacillus — 
coli communis , destruction ol corn pentoses. 660 
Jlavigena , destruction of com pentoses. 660 
spp., comparison with growth types of Azo¬ 
tobacter.404,408,412,422-425,428,429 
Bacon, C. W., Gamer, W. W., McMurtrey, 
J. E., and Moss, E. G., Sand Crown, a Chlo¬ 
rosis of Tobacco Due to Magnesium Defi¬ 
ciency, and the Relation of Sulphates and 
Chlorides of Potassium to the Disease. 27-40 
Bacteria— 
life cycles studies. Part II. Life History 
of Azotobacter. 401-432 
soil, studies.40X-432 
Bacterial Leaf spot of Geranium in the 
Eastern United States: Nellie A. Brown. 361-372 
Bacterial Leaispot of Tobacco: James 
Johiison.481-494 
Bacterium — 
erodii, comparison with Bacterium pelar- 
goni .363-370 
influenza , growth forms, comparison with 
Azotobacter SPP.401,417 
melleum, cause of leaf spot, description, cul¬ 
tural characters.481,484-489 
pelargoni, cultural characteristics, mor¬ 
phology, and description_361-372 
geranium leafspot.36X-372 
spp., comparison with growth types of Azo¬ 
tobacter.404,4x7,419,421-425 
Baking, tests, flour characters, data. 535-54* 
Baku barley, description, and water content 
of kernels, growth.333.340,342, 349 , 354 ,356.358 
Barley— 
germination, results of forcing methods.... 82, 
84,85.87,90,93 
growth and ripening, water content of 
kernel.;.333-360 
kernels, water content during growth and 
maturation. 333“36o 
naked varieties, water content of kernels 
during growth. 333-360 
Bean— 
Kulthi, growing, experiments with day¬ 
light of different lengths. 874 
seed, content of iron and manganese. 397 ,398 
seed germination temperature, notes. 322.326-329 
Beets— 
growing, experiments with daylight of 
different lengths.888,896 
seed-germination temperature, notes. 322,326-329 
(ion) 
