1916] CONTENTS. IH 



Page. 



On the use of the porometer in etomatal investigation, Knight 431 



Recording porometer and stomatal behavior in wilting, Laidlaw and Knight. . 431 



The gas exchanges of water plants, Kniep 431 



Synthetic processes in plants, II, Boysen-Jensen 431 



Influence of temperature on rate of growth in Pisum, sativum, Leitch 432 



Sap ascent, Copeland 432 



The cohesion theory of water movement, Renner 432 



Cohesion and osmosis, Steinbrinck 432 



The cohesion of water in the annulus of the sporangium in ferns, Ursprung 432 



Views of biological adsorption phenomena, Czapek 432 



Studies on the entrance of salts into living cells, Fitting 432 



Absorption of ions by plants, Pantanelli 433 



Rapidity of absorption of anions and cations by plants, Bobko and Sinskaia. . . 433 



The equivalent absorption of anions and cations by plants, Ritman (Rittman) . . 433 



Effect of osmotic pressure in nutrient solutions on plant growth, Stol'gane 434 



Stimulants of plant growth, Chirikov (Tschirikow) 434 



Metabolism of nitrogen in barley noiu-ished on ammonium salts, Smirnov 434 



Relation of etiolated maize and lupine to ammonia and nitrates, Prianishnikov. 435 



Stereochemistry and the biological action of ammonium compounds, Plate 435 



The action of ammonium compoimds on Avena sativa, Plate 435 



Direct assimilation of atmospheric nitrogen by plants, Mameli and Pollacci 435 



The question of absorption and utilization of chlorids by plants, Kablukov 435 



Magnesium in chl orotic or discolored plants, Mameli 435 



The influence of phosphorus and magnesium on chlorophyll formation, I^fameli. . 435 



Influence of pyrrolic acid nucleus on chlorophyll formation, Pollacci and Oddo. 435 



Effect of concentration of nutrient solution on barley and wheat, Brenchley.. . 436 



The influence of strong Rontgen rays on the higher plants, Koernicke 436 



Smoke as a means of shortening winter rest, Molisch ■. 436 



Botanical diagnosis of smoke injury in forests, Neger 436 



Anomalies in Beta vulgaris, I, II, Munerati and Zapparoli 436 



Studies on the phylogeny of Nicotiana tabacum, Anastasia 436 



The floral biology of the peach, Campbell 436 



The floral biology of the almond, Campbell 437 



Chimeras and graft hybrids, Buder 437 



FIELD CROPS. 



The root systems and leaf areas of corn and the sorghums. Miller 437 



Spacing and feeding the individual plant in plant breeding, Leidner 437 



Rotations and tillage methods in western Nebraska, Snyder and Osborn 438 



Carrying capacity of grazing ranges in southern Arizona, Woo ton 439 



Cereal crops in the Panhandle of Texas, Ross 440 



Fodder grasses of Java, X-XIII, Backer 440 



Experiments with field carrots on sandy soil at Flahult, von Feilitzen 440 



Button clover, McKee 440 



Inbreeding in maize, Jones 441 



A Persian and other forms of emmer, Schulz 441 



Lespedeza seed, Dworak 441 



The injurious effect of lime on the lupine and its prevention, Creydt 441 



Some recent investigations in sugar-beet breeding, Pritchard 442 



Breaking the leaves of sugar beet as a means of increasing the yield, Remy 442 



Making beet seed germination tests, Plahn 442 



Sugar-cane experiments in the Leeward Islands, Tempany et al 443 



Anatomical structure of leaves of different varieties of spring wheat, Heuser. . . 443 



Marquis wheat. Ball and Clark 443 



The disinfection of seeds, Archikhovskii (Arcichovskij) 444 



Weeds in the poppy fields of Volhynia and Podolia, Kamenskii (Kamensky) . . 444 



HORTICULTURE. 



The Australian gardener, revised by Falkner 444 



Gardening investigations, Schmid 444 



The acclimation of plants and their adaptation to soil by grafting, Dental 444 



A spraying manual 445 



How to make hotbeds and cold frames 445 



How to make a vegetable garden 445 



Some results in size inheritance, Groth 445 



