CONTENTS. ni 



Page. 



Bactena and soil fertility, Brown 127 



The niycorrhlzas of forest trees, McDoufirall 127 



The relation of living chlorophyll to light, Iwanowski 128 



Investigations on the pigments in chromoleucites, Lubimenko 128 



The role of vellow pigment in chloroplasta, Iwanowski 128 



Studies on tlie chemical process of anthocyanin pigment formation, Combes. . . 128 



Some conditions of formation and decomposition of starch, Lundegardh 128 



Physiology of latex in some rubber plants, Tobler 128 



Microchemical recognition and distribution of aluminum in plants, Kratzmann. 129 



Some effects of colloidal metals on Spirogyra, Hoyt 129 



Influence of radio-activity on plants, Malpeaux 129 



Penetrative power of violet and ultraviolet rays in leaves, Dangeard 129 



Axial abscission as the result of traumatic stimuli, Gortner and Harris 129 



The survival of plant tissues after freezing, Russell 130 



The frost problem up to date, Frazer 130 



Can selection improve the quality of a pure strain of plants? Hagedoorn 130 



Coloration of the seed coat of cowpeas, Mann 130 



On the appearance of sterile ' ' dwarfs " in Hiimulus lupulus, Salmon 130 



FIELD CROPS. 



A table for estimating statistical constants. Pearl and Miner 130 



Note on the accuracy of bushel-weight determinations, Barber 131 



Influence of shape and size of plats in tests of varieties of grain, Barber 131 



Deep plowing and subsoiling, Wright 131 



The improvement of plants, Blaringhem 131 



The breeding of forage grasses, Lang 131 



The history of the cultivated cereals, I, Schulz 131 



Culture of legumes with special reference to nitrogen a.ssimilation, Heinzc 131 



The inoculation of legumes, Bro\vn 131 



Influence of soil volume and available plant food on cereals, Burmester 132 



Leguminous crops in North CaroUna, Parker 132 



Soine examples of the potash requirements of legumes, Clausen 132 



Plants for the desert, Semler 132 



Desert plants of Mexico, Ochoterena 132 



Field experiments. Woods 132 



Report of the agricultural experimental station in St. Croix, 1912 133 



Field experiments and demonstrations 133 



[Field crop experiments], Smith 133 



Alfalfa seed production ; pollination studies. Piper et al 133 



Barley culture in Wisconsin, Moore and Stone " 134 



Cactus opuntia as a forage crop for arid regions 134 



Chilian clover, Hadfield 134 



Studies in variation of red clover, Pammel and Clark 134 



PolUnation of clover, Pammel and King 134 



Inheritance of recurring somatic variation in maize, Emerson 135 



Maize variety trial, 1912, McMillan 135 



Cotton experiments, 1913, Ricks, Ferris, Ames, and Walker 136 



Recent trials with cotton in Grenada, Auchinleck 136 



Cotton production in the German colonies, Supf 136 



Cultivation of kapok to replace that of caoutchouc, Cantzler 136 



Germination of oats, Brioux 136 



Effect of certain artificial manures on the bushel weight of oats 136 



The potato question, Planchon 137 



Potato-sprapng experiments at Rush in 1913, Stewart 137 



Thoroughness pays in potato spraying. Hall 137 



Prickly pear as a forage plant, Martinez 137 



The classification of rice in the Central Pro^'inc€s, Graham 137 



Experiments with sulphate of ammonia and nitrate of soda on rye, Wehnert. . . 137 



Silver beet: Its use as a forage crop, Macpherson 137 



Possible economies in sugar production, Dodson 137 



Sweet potatoes, Mooring 138 



Tobacco breeding, Lang 138 



Variation in tobacco, Hayes 138 



Changes produced by selection in experiments with tobacco. East and Hayes. . 138 



Field experiments with wheat, 1912, Chapman et al 139 



