Apr. 7-June 30, 1923 
Index 
1055 
Page 
Nutrition— 
plant, relation to electricity. 41-54 
value of mixtures of proteins from corn and 
various concentrates. 971-978 
Nutritive Value of Mixtures of Proteins from 
Com and Various Concentrates: D. Breese 
Jones, A. J. Finks, and Carl O. Johns... 971-978 
Nutritive Value of the Georgia Velvet Bean 
{Stizilohium deeringianum): J. W, Read and 
Barnett Sure. 433-440 
Nutting, Grace B., and Morris, H. E.: Identi¬ 
fication of Certain Species of Fusarium Iso¬ 
lated from Potato Tubers in Montana_339-364 
Oats— 
breeding for rust resistance. 1016-1017 
composition of crops grown in different lo¬ 
calities. ' . 1047 
growth, temperature range. 571-572, S 7 S 
leafspot, cause, description, and control.. 663-667 
loose smut— 
infection, relation to soil factors. 569-575 
spore germination, influence of tempera¬ 
ture, moisture, and oxygen. 577-597 
protein percentage, effect of respiration 1041-1048 
stem rust— 
biologic forms on varieties. 1013-1018 
study of biologic form. 539-568 
Occurrence and Significance of Phloem Nec¬ 
rosis in the Irish Potato: Ernst F. Art- 
schwager. 237-246 
Oil, onion— 
effect on growth of Colletotrichum cir- 
cinans . 1024-1025 
relation to onion smudge.... 1023-1027 
Oils— 
apple, relation to internal browning of 
apples. 174-181 
cow rations, effect on fatty acids in butter- 
fat. 380-392 
Oleic acid, butterfat, analyses and notes. 366, 
370-3t79> 386-396 
Olson, George A.: A Study of Factors Affect¬ 
ing the Nitrogen Content of Wheat and of 
the Changes that Occiu: during the Devel¬ 
opment of Wheat.. 939“953 
Onion— 
bulbs, inoculation with Colletotrichum cir- 
cinans, results . 1020-1022 
disease resistance, relation of scale pig¬ 
ments. 1027-1033 
oil, relation to onion smudge. 1023-1027 
sap acidity, relation to smudge... 1033-1036 
smudge— 
* resistance, by varieties. 1019-1040 
testing for susceptibility to. 1021,1022 
varietal resistance to. 1019-1040 
On the Use of Calcium Carbonate in Nitrogen 
Fixation Experimmts: P. U. Gainey- 185-190 
Oospora lactis parasitica, morphology, effects, 
distribution, and control. 895-906 
Orange— 
leaves, shoots, roots, and trunks, dry weight 
and analyses. 807-810 
rust, raspberry injury.885-894 
seedlings, growing in solutions of sodium 
and calcium... 755 
trees— 
growing in— 
sand, growth and composition, 
studies. 801-813 
soil cultures, growth and composition, 
studies. 801-813 
susceptibility to citrus scab, notes. 955-958 
Orchards, temperature, relation to internal 
browning of apples. 17 r-i 74 
Oxidation of Sulphur by Microorganisms in 
Black Alkali Soils: Selman A. Waksman, 
Clara H. Wark, Jacob Joffe, and Robert L. 
Starkey. 297-306 
Oxygen, effect on spore germination of oats 
smut.... 588-589 
Palmitic acid, butterfat, analyse and notes.. 366, 
37o-379>386-396 
Paris green, preparation and use as insecti¬ 
cide. S03>5I2,5I9 
Parasites, striped sod webworm.411-412 
Parasitic action of fungi, literature cited... 877-878 
Page 
Paspalum spp., injury by Helminthosporium 
micropus . 643,720-722 
Peach Rosette, an Infectious Mosaic: J, A, 
McClintock. 307-316 
Peach- 
rosette, infectious mosaic. 307-316 
trees, budding with rosetted plum and 
almond buds, results.307,311,313 
Peanut— 
meal with com, feeding ex^riments. 974-975,976 
oil in cow feed, effect on acids in butterfat, 
notes. 381-392 
Peas— 
breeding experiments in studies of “Rogue” 
type. 815-852 
garden, rogue types, inheritance studies.. 815-852 
growing in soils with and without manga¬ 
nese, experiments... 789,790,791 
Peat— 
acidity, laboratory studies.485-487 
soils, studies in relation to failure of concrete 
draintile.. 474-497 
Pectin, media, effect on pectinase produc¬ 
tion. 867,868,875,876 
Pectinase production, relation to— 
acidity of substrate. 861-878 
hydrogen-ion concentration of substrate . 861-878 
Peltier, G. E., and Frederich, W. J.: Rela¬ 
tive Susceptibility of Citms Fruits and 
Hybrids to Cladosporium citri Massee.... 955-959 
Penicillium roseum, cause of gummosis. 215, 
221-222,232 
Pfeffer’s solution, use in pectinase studies, 
formula.862-865 
Phloem necrosis of potato, occurrence and 
significance. 237-246 
Phorocera claripennis, parasite of striped sod 
webworm. 411-412 
Phosphoms, absorption by growing wheat.. 950 
Physiological Requirements of Rocky Moun¬ 
tain Trees: Carlos G. Bates.. 97-164 
Physiology, forest trees, studies. 105-163 
Phytophthora — 
parasitica, identical with P. ierresiria ...... 211 
terrestria, cause of mal di gomma, relation 
citrophthora. 191,210-213,231 
Pierce, H. B., Holland, E. B., Garvey, M. E., 
Messer, A. C., Archibald, J. G., and Dun¬ 
bar, C. O.: Determination of Fatty Acids 
in Butterfat—^II. 365-398 
Pigments, onion scale, relation to disease 
resistance. 1027-1033 
Pinckney, R. M.: Action of Soap upon Dead 
Arsenates. 87-95 
Pine—’ 
bristlecone, physiological studies. 106-145^ 159-160 
limber, physiological studies. io6-i4S> 15S-160 
lodgepole— 
physiological studies. 106-160 
se^ germination and growth habits, 
notes. 157-159 
Scotch, transpiration.tests.. 120-145 
Western yellow, physiological studies.... 106-160 
yellow, seed germination and growth 
habits, notes. 157-159 
Pirsch, Gregor B.: Studies on the Tempera¬ 
ture of Individual Insects, with Special 
Reference to the Honey Bee... 275-288 
Pisum sativum, inheritance studies, in relation 
to rogue types. 815-852 
Pittman, D. W., et al.: Toxicity and Antag¬ 
onism of Various Alkali Salts in the Soil. 317-338 
Plant- 
growth, effect of manganese in the soil, in¬ 
vestigations . 781-783 
nutrient, manganese necessity, investiga¬ 
tions. 781-794 
Plants— 
ability to feed in competition with other 
plants. 50-51 
acid and neutral soils, effect of manganese. 781-794 
food movement in soil. 52-53 
inoculation with cane mosaic, experiments, 
results. 248-255 
nutrition, relation to electricity. 4 i-S 4 
stunted, immunity to mosaic disease, note. 257 
susceptibility to arsenical poisoning from 
sprays, differences. 511-514 
