INDEX 
Page 
Aamodt, Olaf S.: The Inheritance of Growth 
Habit and Resistance to Stem Rust in a 
Cross between Two Varieties of Common 
Wheat. 457-470 
Aamodt, O. S.— 
and Harrington, J. B,: The Mode of In¬ 
heritance of Resistance to Puccinia 
graminis, with Relation to Seed Color 
in Crosses between Varieties of Durum 
Wheat. 979-996 
and Hayes, H. K.: A Study of Rust Re¬ 
sistance in a Cross between Marquis 
and Kota Wheats. 997-1012 
Abies rust occurrence, note. 893 
Acetic acid, presence in soils, effect on Azoto- 
bacter content. 294-295 
Acid, addition to soils, effect on Azotobacter 
content. 294-296 
Acidity— 
effect on nitrogen growth and fixation by 
Azotobacter cultures. 759-767 
onion juice, relation to disease resistance of 
onion... 1033-1036,1038 
soil, effect on Azotobacter flora and nitrogen¬ 
fixing ability. 907-938 
Acids— 
fatty, determination in butterfat.365-398 
organic, in soils, effect on Azotobacto* con¬ 
tent. 295-296 
Action of Soap upon Lead Arsenates: R. M. 
Pinckney. 87-95 
Aedospores, grain rust, on Berberis spp. 540, 
S45»546,555-560,565 
Agar, addition to arsenical sprays, effects. 525 
Agrostis stoUmifera, injury by Helwiinthospor* 
turn stenacrum .682-683 
Ainslie, George G.: 
Strips Sod Web worm. Cr ambus muUtbUis 
Clemens. 399-414 
Silver-Strip^ Webworm, Crambus prae-^ 
fectellus Zindcen. 4x5-426 
Air, upper, spores. 599-^ 
Airplanes, use in study of spores in the upper 
air. 599-600,605 
Alcohol, use in comseed treatment for downy 
xnildew. 855 
AlkaK— 
black. See Sodium carbonate, 
salts— 
in soil, toxicity and antagonism.317-338 
studies, and literature regarding. 317- 
319 ; 337-338 
testmg in tiles. 477-480 
Almonds, budding with rosetted buds, re¬ 
sults. *313 
Alternaria sp., relation to citrus gummosis. 222,232 
Ammonium salts— 
efficiency as nutrients for rice. 623-624 
relation to rice chlorosis. 625-635 
Anaesthetics, effect on cell sap of apples. 174 
Analyses, orange leaves, shoots, trunks, and 
roots. 808-810 
Apenteles crambi, parasite of the striped sod 
webworm. 412 
Aphis matdis, mosaic transmission to plants, 
tests. 251-255 
Apple- 
injury by arsenical sprays.511; 512,515-519 
internal browning, description. 165-166 
scald, comparison with internal browning 178-179 
tissue, permeability, relation to disease., 179-181 
Yellow Newtown, internal browning, study 165- 
184 
Apples— 
harvesting time, relation to internal brown¬ 
ing. 168-169 
storage, temperature relations to disease... 165, 
169-171 
Apples— Page 
wrapping with absorbents for prevention of 
internal browning. i77-i79 
Apricot, stunting by peach rosette... 309 
Archibald, J. G.: et al.: Determination of 
Fatty Acids in Butter Fat.— III .365-398 
Arizona, desert vegetation.. 103 
Arsenic— 
solubility increase by addition of soap to 
lead arsenates. 90-93 
trioxid, preparation, and use as insecticide 502, 
519 ;521 
Arsenical— 
compounds, soluble, spraying experi¬ 
ments. 517-518 
sprays, injury to foliage. 501-538 
Arsenicals used as insecticides, composition, 
application, and results. 502-511 
Artschwager, Ernst F.: Occurrence and Sig¬ 
nificance of Phloem Necrosis in the Irish 
Potato". 237-246 
Ashby agar, medium for Azotobacter culture 
growth, formula. 264 
Australia, citrus trees, injury by gummosis.. 193 
Avena varieties, Puccinia graminis, biologic 
forms. 1013-1018 
Awns, wheat, relation to seed diaracters.. xooi-xooa 
Azores, citrus trees, injury by gummosis. 192 
Azotobacter— 
cell, composition, studies. 265-266 
cultures— 
nitrogen growth and fixation, influence of 
hydrogen-ion concentration. 759-767 
production and analyse. 264-265 
flora in soil, relaticm to acidity.907-938 
growth, effects of calcium carbonate in me¬ 
dium......— 185-189 
protein synthesis. 263-274 
soils reaction, change, effect, study.289-296 
Bacillus carotovorus, cause of rot in tomato.... 895, 
897; 901,904 
Bacteria— 
acid production in nutrient solutions. 873 
soil, sulphur oxidation in alkaline soils... 299-304 
Bacterium fUtccumfaciens cause of bean wilt, 
note. 749 
Bacterium gummis, cause of citrus gummosis 194,227 
Bailey, D. L.. et al: Biologic Forms of Puccinia 
graminis on Varieties of Avena spp. 1013-1018 
Bamboo, edible, immunity to cane mosaic... 249 
Barberry, susceptibility to grain rust, differ¬ 
ing in varieties.540,545,546; 555-560,565 
Barley- 
composition of crops grown in different lo¬ 
calities. X047 
injury by Helminthosporium spp— 642,650-663, 
691-693;70X,704 
netblotch, cause, description and con¬ 
trol.. 642,656-663 
protein percentage, effect of respiration. 1041-1048 
stripe disease, cause, symptoms, descrip¬ 
tion, and control. 642,650-656 
Bartholomew, Lucille K., and Jones, Edith S.: 
Relation of C^ain Soil Factors to the In¬ 
fection of Oats by Loose Smut. 569-575 
Batchelor, H. W. and Gainey, P. L.: Influence 
of the Hydrogen-Ion Concentration on the 
Growth and Fixation of Nitrogen. 759-767 
Bates, Carlos G.: Physiological Requirements 
of Rocky Mountain Trees. 97-164 
Bean— 
decoction, testing for pectinase production.. 864- 
865,870 
wilt, moisture effect. 749-752 
Beef bouillon, testing for pectinase produc¬ 
tion.864-865,870 
Bees— 
Camiolian, temperature studies.. 281,284-285 
freezing point, studies. 276,277,279,285 
(1049) 
