Apr. 7-June 30, 1923 
Index 
1051 
Conifers— Page 
nursery stock, snow molding, control.... 741-748 
shade tolerance, comparison of species... 156-160 
transpiration tests and sap density, 
studies. 106-145 
water requirements. 114,124,126 
winterkilling resistance, comparison of 
species. 154-160 
Control of Snow Molding in Coniferous Nursery 
Stock; C. F. Korstian. 741-748 
Copper aceto-arsenite. See Paris green. 
Coprinus atramintarius, relation to citrus 
gummosis..... 222,232 
Com— 
and concentrates, protein mixture, nutri¬ 
tive value. 971-978 
Boone County White Dent, seed treatment 
for downy mildew. 855,857 
breeding work, use of oriental varieties, 
restrictions. 853 
Calamba yellow flint, seed treatment for 
down mildew.855,856 
leaf blight, same as com white blast. 712-718 
Manobo waxy, seed treatment for downy 
mildew. 85S»8s7 
injury by— 
silver-stripped webworm. 417 
striped sod webworm.400,401,407 
nitrogen absorption, comparison with kafir. 50-51 
oil in cow feed, effect on adds in butterfat, 
notes.381-392 
seed— 
mosaic transmissimi, experiments. 261 
treatment for control of downy mildew. 853-860 
seedlings, nitrogen absorption, comparison 
with kafir. 50-51 
smut, spore germination, i^uence of tem¬ 
perature.;.. 593 “'S 97 
varieties— 
in Philippines, seed treatment for downy 
mildew.855-858 
susceptibility to mosaic disease, tests.. 256-259 
white blast, cause, description, and 
control. 643,712-718 
Corynmnt berynkii, rdation to dtms gum¬ 
mosis. 221,222,232 
Cows— 
butterfat tests, records of condition, rations, 
and milk.367» 37380-382 
Massachusetts herds, milk, butterfat 
analyses and results.392-396 
C rambus. See Webworm. 
comparison ^th— 
C.mtUabUis .400-401,410-411 
Pfoefectellus . 415,424 
literature cited.414,424-425 
Cultivated and Wild Hosts of Sugar-Cane or 
Grass Mosaic: Brandes, E. W., and Klap- 
haak, Peter J. 247-262 
Curran, Gordon C., Stakman, E. C., Henry, 
A. W., and Christopher, W. N.: Spores in 
the Upper Air. 599-606 
Czapek’s nutrient solution, use in pectinase 
studies. 862-877 
Darkness, effect on injury by arsenical sprays. 53 2 
Darrow, G. M., work on raspberry infection 
with rust. 885 
Deromposition, soil, effect on concrete drain- 
tile.. 471-500 
Desert vegetation, Arizona. 103 
Determination of Fatty Adds in Butterfat; 
II, Holland, E. B., Garvey, Mary E., 
Pierce, H. B., Messer, Anne, C., Ardiibald, 
J. G., and Dunbar, C. 0 .365-398 
Dextrose, effect— 
in culture media on growth of Rhizopus sp. 35-38 
on growth of Azotobacter, yield, and 
nitrogen fixation. 267-270 
Diplodia sp., relation to dtrus gummosis. 194, 
222,224,232 
Disease Resistance— 
of plants, literature, list. 1038-1039 
to Onion Smudge: Walker, J. C. 1019-1049 
Distichlis spicata, injury by Helmintkosporium 
halodes . 707-709 
Dodge, B. O.: Morphology and Host Rela¬ 
tions of Pucciniastfum americanum .885-894 
Draecidacephala molipes, mosaic transmission 
to plants, tests. 251-253 
Page 
Drain Tile, concrete, failure in peat soils in¬ 
vestigations.47 i-‘Soo 
Drechsler, Charles: Some Graminicolous 
Spedes of Helmintkosporium . 641-740. 
Dunbar, C. O., Holland, E. B., Garvey, M. E., 
Pierce, H. B., Messer, A. C., and Archibald, 
J. G.: Determination of Fatty Acids in 
Butterfat.—II.365-3 98 
Dunkirk clay, loam soil, manganese pot 
treatments of plants, 1923. 786-790 
Durum wheat crosses, resistance to Puccinia 
inheritance mode. 979-996 
Effect of Different Concentrations of Man¬ 
ganese Sulphate on the Growth of Plants 
in Add and Neutral Soils and the Necessity 
of Manganese as a Plant Nutrient, J. S. 
McHargue. 781-794 
Effect of Organic Decomposition Products 
from High Vegetable Content Soils upon 
Concrete Drain Tile; G. R. B. Elliott.. .. 471-500 
Effect of Respiration upon the Protdn Per¬ 
centage of "^^eat. Oats, and Barley; F. W. 
McGinnis, and G. S. Taylor. 1041-1048 
Electrometric hydrogen-ion determination, 
method. 909-912 
Elc^ridty, relation to plant nutrition.41-54 
Elliott, G. R. B.: Effect of Organic Decompo- 
siti<m Products from High Vegetable Con¬ 
tent Soils upon Concrete Drain Tile.471-500 
Emmer, Khapli, rust resistance, note. 980 
Energy, sources for Azotobacter growth. 267 
Enzyms, relation to gum formation in dtrus 
trees. 227-228 
Eragrbstis spp. injury by Helmmikosporhim 
spp. 711,722-724 
Europe, dtrus trees injury by giunmosis... 192-193 
Exorisia nigripalpis^ parasite of striped web¬ 
worm.411,412 
Extracts, tobacco, nicotine determination, 
improved method. 961-970 
Faw<^tt, Howard S.: Gummosis of Citrus.. 191-236 
Feeding, experiments with com and various 
concentrates, results. 972-977 
F^rous arsenate, preparation, and use as an 
in^tidde.. 503-504> Si9> 521 
Fertilizers— 
effect on wheat, study, historical review_ 941 
nitrogenous, relation to rice chlorosis.621-640 
Fescue, injury by Helminthosportum dicty- 
oides . 677-679 
Finks, A. J., Jones, D. Breese, and Jdins,C. O.: 
Nutritive Value of mixtures of Protein from 
Com mid Various Concentrates... 971-978 
Fir, Douglas- 
physiological studies. 106-160 
seed germination and growth habits, notes 157-159 
susceptibility to snow mold. 741-744,748 
Flies, tachinid, enemies of striped sod web¬ 
worm. 411-412 
Foliage, injury by arsenical sprays. 501-538 
Foods, plant, transfer within the plant. 50-51 
Forest- 
experiment stations, establishment and 
work. 104 
zones, tree types and sites, study, objects 
and methods.97-102 
Forests, environmental data, interpretation, 
aid of physiological studies. 105-160 
Formic acid, presence in soils, effect on 
Azotobacter content. 296 
Frederich, W. J., and Peltier, G. E.: Relative 
Susceptibility of Citrus Fmits and Hybrids 
to CladosPorium citri Massee.9SS"9S9 
Freezing, dtms bark, relation to gum forma¬ 
tion . 225 
. soil, effect on movement of soil mois¬ 
ture. 427-432 
Fry, William H.: The Microscopic Estima¬ 
tion of Colloids in Soil Separates.879-883 
Fungi— 
acid production in nutrient solutions.873,875 
action on skin of fruits discussion.899,901-903 
growth in culture media containing dex- 
troes, experiments. 35-38 
pathogenic, distribution in upper air. 59^05 
rots, studies, and literature cited. 1,39-40 
temp^ature relations, studies of eleven 
Rhizopus spp. 1-40 
