Jan. 5-Mar. 29, 1924 
Index 
971 
Protein— Page 
crystals in potatoes. 824 
colloidal, of plants, acidity relations. 123-124 
Prussic acid. See Hydrocyanic acid. 
Puccinia — 
graminis — 
appressoria number, relation to wheat 
leaf infection. 388-390 
germ tubes entrance into hosts, factors 
affecting. 384-390 
tritici, resistance of wheat, studies.381-412 
See Stem rust, wheat. 
xanthis, infection of apple leaves, effect.... 109 
Pumpkin seeds, effect on growth of rats.39-42 
“ Purples.” See Nematode disease. 
Pyrausta nubilalis, comparison with Euro¬ 
pean com borer. 65-70 
“Radekrankheit” (nematode disease). 925-956 
Radish, summer, response to length of day¬ 
light, experiments. 141-143 
Ramose-teosinte hybrids, characters, inheri¬ 
tance. 566-577,594-595 
Raspberries— 
diploid and polyploid forms, cytological 
studies. 737-748 
forms, literature, citations. 747-748 
historical and cytological description .... 739-745 
pollen, sterility, cause. 745 
Raspberry-blackberry hybrids, characters. 745-746 
Rats, feeding on wild rice, experiments_ 221-224 
growth, effect of pumpkin seeds on. 39-42 
Reddy, Charles S., and Holbert, James R.: 
The Black-Bundle Disease of Com. 177-206 
Refrigeration, effect on bean weevils. 100-105 
Reproduction, plant, relation to photope- 
riodism... 120 
Respiration, apples, coated and normal fruits, 
measurements. 24-31 
Rice— 
comparison with milk in composition.... 220-221 
cultivated, comparison with wild. 220 
wild, composition, analyses, nutritive 
properties. 219-224 
Richey, Frederick D.: Adjusting Yields to 
Their Regression on a Moving Average as a 
Means of Correcting for Soil Heterogeneity. 79-90 
Ripening, apples, changes on the tree and in 
storage. 1-23 
Roberts. John W.: Morphological Characters 
of Alternaria malt . 699-708 
Roeslerta hypogaea , life history, synonomy, 
and cultures.609-616 
Rome Beauty apples, respiration in storage 
at different temperatures. 28-30 
Root crops— 
destruction by meadow mice. 533 
louse, strawberry, life history, notes. 513, 
516,517,519,521 
sweet potato— 
anatomy and internal breakdown.157-166 
early differentiation and development. 158-162 
internal breakdown in storage. 164-166 
structure, anatomical details. 157-158 
Rootrot— 
com, relation to wheat scab. 869-871 
studies.957-964 
grape, fungus, Roeslerta hypogaea, life his¬ 
tory. 609-616 
susceptibility, effect on com root system.. 74-77 
Roots, com— 
anchorage and extent. 71-78 
elemental composition and weight. 854-858 
Rosa pratincola, current cane blight occur¬ 
rence. 840-841 
Rose, currant blight, occurrence. 839-840 
potato, structural characters. 827,828,830 
Rotation, crop— 
relation to diseases caused by Gibberella 
saubineiti . 861-880 
to control wheat nematodes. 952“953 
Rots, fungi, inoculation into com, experi¬ 
ments and results. 961-963 
Rubus— 
orange rusts, aecidiospore distribution. 749, 
. . 753-754 
spp„ chromosomes and pollen condition, 
studies. 739-747 
Rudbeckia bicolor, response to length of day¬ 
light, experiments. 143-144 
Rural potato, structural characters.... 827,828,833 
Rust— Page 
bayberry, aecidiospore discharge, studies. 749-756 
cereal, relation to fertilizers. 342-345 
development, effect of certain mineral nutri¬ 
ents. 115-117 
infection, effect on water requirements of 
wheat. 107-118 
orange, on blackberry, aecidiospore distri¬ 
bution. 749 , 753“754 
resistance— 
relation to structure of wheat stem_390-394 
wheat sap properties.401-404 
Rye- 
injury by nematode disease. 926-933,953 
nematode infection from wheat galls. 934 
rust infection, relation to fertilizers. 349 
Sacaton, Ariz., experiments in reclaiming al¬ 
kali land. 667 
Sagebrush association, physicochemical con¬ 
stants. 898-903 
Salt River Valley, Ariz., irrigation experi¬ 
ments .. 622,645 
solutions, effect on eggs of Ascaris lum- 
bricoides . 171 
Salts, nutrient, relation to development of 
stem rust.....394-401 
Sand-hill, mixed association, physicochemi¬ 
cal constants. 903-904 
Sando, W. J., and Eeighty, C. E.: The Bloom¬ 
ing of Wheat Flowers. 231-244 
Sap— 
desert plants, investigations. 893-924 
wheat, physicochemical properties, relation 
to rust resistance. # .401-404 
Sarcobatus vermiculatus, associated with shad 
scale, physicochemical constants.. 908-914 
Sawdust, hydrolyzed, feed value. 251 
Scab, wheat, relation to previous crops, and to 
com rootrot. 862-871 
Sclerospora — 
graminicola, nocturnal production of coni- 
dia. 771-784 
spp., conidia production, comparisons... 775“78 i 
Scofield, Carl S.: The Movement of Water in 
Irrigated Soils.617-693 
Seed-Color Inheritance in Certain Grain- 
Sorghum Crosses: John B. Sieglinger.---53-64 
Seed— 
com— 
infection determination. 194 
with fungi, determination method.959-960 
inoculation with Cephalosporium acre- 
monium, experiments. 194-203 
sorghum, color inheritance in certain grain- 
sorghum crosses. 53 _ 54 
soybean, mosaic transmission.91-98 
wheat, cleaning to control nematode disease 953 
Seedlings— 
growing in acid solutions, changes in hy¬ 
drogen-ion concentration. # 207-217 
wheat, susceptibility to stem rust, varia¬ 
tions. 396-401 
Selective Fertilization in Cotton: Thomas H. 
Kearney and George J. Harrison.329-340 
Serum— 
fowl— 
action on cells of various animals, litera¬ 
ture. 709-711,715 
effect on sheep cells, experiments. 714-715 
guinea-pig, action on sheep cells. 713-714 
Shadscale association, physicochemical con¬ 
stants. 906-907 
Sheep— 
blood, effect of serum from fowls. 709-715 
cells, hemolysis, action of serum from rab¬ 
bits, guinea pigs, and fowls. 712-715 
feeding with hydrolized grain hulls. 252 
Shive’s solution, use in nutrient treatments 
for wheat, formula. hi, 116 
Shoshone Project, Wyo., irrigation water.. 672,673 
Shrubs, Tooele Valley, Utah, physicochemi¬ 
cal constants. ; ... 898-916 
Sieglinger, John B.: Seed-Color Inheritance 
in C ertain Grain-Sorghum Crosses. 53-64 
Silica, determination in soil solutions. 644 
Silicon, com plant, determination and dis¬ 
tribution. 850-858 
Simmons, Perez, and Larson, A. O.: Insecti¬ 
cidal Effect of Cold Storage on Bean Wee¬ 
vils. 99-105 
