1918] CONTENTS. HI 



Page. 



Some factors concerned in the germination of rust spores, Mains 224 



Light and pycnidia formation in the Sphseropsidales, Levin 225 



Some cultural characteristics of Pestalozzia funera, Siggers 225 



Colorimetric deteiToination of hydrogen ion concentration, Clark and Lubs 225 



A new apparatus for aseptic ultrafiltration , Smith 225 



Irritability of the pollen-presentation mechanism in the Compositse, Small 225 



Endothia pigments. — I, Hawkins and Stevens 225 



Observations on an Achlya lacking sexual reproduction, Weston 225 



Fertility in Cichorium intybus, Stout 226 



Inheritance of endosperm color in maize. White 226 



Inheritance studies in Pisum. — IV, Interrelation of genetic factors, White 226 



FIELD CROPS. 



Factors influencing the water requirements of plants, Thom and Holtz 226 



A new method for harvesting small grain and grass plats, McCall 228 



[Report of field crops work in Nebraska] 228 



[Report of field crops work in Pennsylvania] 229 



[Report of field crops work for 1915],' Harrison et al 229 



[Report of field crops work], Meggitt 230 



[Report of field crops work at Anakapalle], Hilson and Balakrishnamurti 230 



Grains for western North and South Dakota, Babcock et al 230 



Grains for the Utah dry lands, Jones and Bracken 230 



Leguminous crops in desert agriculture, Howard 230 



Comparative value of legumes as green manures, Johnson et al 231 



Soy beans and cowpeas, Fain and Vanatter 231 



Field production of yautias, gabis, and dasheens, Ocfemia 231 



[Variety tests with alfalfa], Brooks and Gaskill 231 



Barley, Pridham 231 



The production of clover seed under irrigation in southern Idaho, Aicher 231 



Increasing the yield of com by crossing, Jones et al 231 



Some indirect effects of certain selections in breeding com, Rietz and Smith. . 232 



[Nitrate experiments on "Nili" maize] 233 



Cotton variety tests for conditions in Georgia, Lewis and McLendon 233 



How to grow cotton in spite of the boll weevil, Williams 234 



Some lint characters of sea-island cotton, Harland 234 



Notes on the destmction of cotton bushes by burning. Shepherd 234 



Ten years' practical experience of Java indigo in Bihar, Reid 234 



Matkee, a green manuring plant. Ram 234 



Cultm-e tests with varieties of oats, 1909-1912, Larsen 234 



Harvesting, picking, thrashing, and storing peanuts, Thompson 235 



The potato, Gilbert, Barms, and Dean 235 



Correlation formulas and varietal differences in disease resistance, Harris 235 



Cooperative potato spraying, 1916, Clinton and Rogers 235 



Significance of hybrid selections with rice and how they are originated, Koch. 236 



Early rice planting for augmenting the supply of irrigation water, Mesman 236 



Population analyses and inheritance studies in rye, Heribert-Nilsson 236 



Grain sorghum seed, Babcock 237 



The purification of soy bean varieties, Jones and Hayes 237 



Harv'esting soy-bean seed, Morse 237 



The sugar beet in Algeria, Vermeil 237 



Action of copper arsenate and arsenioua acid on sugar-cane roots, Jarvis 238 



The progeny of plus and minus variants from pure lines of tobacco, Jensen 238 



Planting tests with tobacco, de Vries and Sidenius 238 



[Report of field experiments with tobacco, 1898-1911], Raciborski et al 238 



A report of tobacco studies near DeU, de Vries 238 



Tobacco culture, Soesman ^ 238 



The influence of green light upon the drjang of tobacco leaves, Jensen 239 



Obsen.^ations on the combustion of tobacco, Sidenius 239 



Tests of winter wheat 239 



Wheat, Noll 239 



Wheat culture, Hutcheson and Wolfe 240 



Wheat growing in tne Southeastern States, Leighty 240 



[Cultural experiments with wheat growing], Spafford 240 



The seeds of cultivated plants and their identification, Francois 240 



Report of seed tests for 1916, Waldron and Stone 240 



Heating seed rooms to destroy insects, Montgomery 241 



