1916] CONTENTS. HI 



Page. 



Quichua names of sweet j)otatoes, Cook 129 



Physico-chemical studies in botany. — I, Germination, Nothmann-Zuckerkandl . 129 



Germination of Zea mays in presence of qninonoids, Roudsky 129 



Light and growth, II, Blaauw 129 



Stimulation of protoplasmic streaming by rays, Nothmann-Zuckerkandl 130 



Pigments of fruits in relation to genetic experiments, Atkins and Sherrard 130 



The origin and transformations of anthocyanin products, Moreau 130 



Oxidases and their inhibitors in plant tissues. — IV, Flowers of Iris, Atkins 130 



The formative starches of green leaves and their utilization, Neger 131 



The starch economy of green plants, Neger 131 



Starch formation in underground portions of herbaceous plants, d'Arbaumont. . 131 



Humus as a soui'ce of carbon for green plants, Molliard 131 



The role of the ash constituents in living plants, I, Egorov 131 



The root nodules of Ceanothus americanus, Bottomley 132 



The aerating system of Viciafaba, Hunter 132 



On the coagulation of Hevea latex, Eaton and Grantham 132 



The assimilative capability of witches' brooms on cherry, Heinricher 132 



Dwarfing effect of trees upon neighboring plants, Bergen 132 



Radium and plant growth 133 



Bibliography on the effect of sulphur dioxid on vegetation and animal life 133 



Disappearance of sulphur dioxid from dilute mixtures with air, Bartells, jr. . . 133 



Defects in the investigation of smoke injur;/, Eicke 133 



Tests of various brands of litmus for bacteriological work, Mason 133 



An electric incubator for bacteriological work, Esten 134 



FIELD CROPS. 



Experiments with field crops in Barbados] 134 



Experiments with field crops at the Tortola experiment station], Watts 134 



Experiments with field crops at St. Kitts-Nevis experiment stations], Watts.. 134 



^Work with field crops on experiment farm at Akola, Berar, 1914-15], Ritchie. . 135 



The production of green forage during the entire year, Tonnelier 135 



The number of temporary roots in the cereals, Wigg^^s 135 



The production and handling of grain in Argentina, Duval 136 



Seed com for the 1916 crop, Hughes and Stanfield 136 



Cotton — varieties and limiting factor tests, Hutchinson 136 



Studies on the cotton plant in Egypt, Balls 137 



Comparative spinning tests of different cottons, Taylor and Dean 137 



"Rib: A unique system of cultivating rice in western India, Buck 138 



The cost of producing sugar beets, Peck 138 



Sweet potato culture in Arkansas, Wicks 139 



Fii-e-holding capacity of leaves as a factor in tobacco breeding, Hoffmanii 139 



Alaska and Stoner or "Miracle" wheats much misrepresented. Ball and Leighty. 139 



The seed field, Bolley 140 



Agricultural seed. Burns 140 



How seed testing helps the farmer. Brown 140 



HORTICULTURE. 



China, a fruitful field for plant exploration, Meyer 140 



Horticultural varieties propagated by vegetative means, Jones 141 



Myrtaceous possibilities for the plant breeder, Wester 141 



Garden calendar for 1916 141 



Fungicide and insecticide inspection 141 



[Spraying in Oregon] 141 



Report of the experimental fields in Poppenburg for the year 1914, Hollmann. 141 



Asparagus, De Baim 141 



Sand for cabbage seed bed, Kains 141 



Studies in lettuce breeding. Durst 141 



Inheritance in tomatoes. Hood 141 



Tomato growing in California, Rogers 142 



Acreage of fruits in California, bearing and nonbearing, in 1915, Weldon 142 



Orchard management investigations, Oskamp 142 



Orchard economics, Richards 142 



The water supply and fruit bud formation. Paddock 142 



The science of orchard heating, Nichols 142 



The root systems of nursery apple trees, Shaw 142 



The results of apple pruning investigations, Alderman 142 



Some points on the general care of apple orchards, Stewart 143 



