1919] CONTENTS. Ill 



AGRICULTURAL BOTANY. 



Page. 



[Report of the investigation and worlc in plant pliysiology], Hibbard 630 



Porous clay cones for the auto-irrigation of potted plants, Livingston 631 



A comparison of permeability in plant and animal cells, Osterhout 631 



Decrease of permeability and antagonistic effects by bile salts, Osterhout- 631 



Antagonism between alkaloids and salts as to permeability, Osterhout 631 



Effect of ions of sodium and calcium chlorid on conductivity, Green 631 



Water requirement as Influenced by environment, Briggs and Shantz 631 



Osmotic concentration of the tissue fluids of desert Loranthacew, Harris 632 



Effect of soaking in water and aeration on Zea mays, Andrews and Beals_ 632 



Comparative studies on respiration. — VI, Irwin 632 



Decomposition of cellulose by Spirochteta, Hutchinson and Clayton 632 



Influence of temperature and hydrogen ion on spore, Itano and Neill 632 



[Viability of Fseudovionas radiicicola], Ockerblad 633 



Prussic acid in Burma beans, Warth and Gyi 633 



A fern having hydi'ocyanic acid, Mirande 633 



Notes on dune vegetation at San Francisco, Cal., liamaley 633 



Root habit and plant distribution in the far North, Pulling 634 



Acclimatization of plants originally of hot climates. Roster 634 



Ends and methods of acclimatization, Lanza 634 



Climax formations, Clements 634 



Mutations in the jimson weed, Blakeslee and Avery 634 



(Enothera ruhrinervis, a half mutant, de Vries 634 



The history of Primula malacoides under cultivation, HiU 635 



Axillary cleistogenes in some American grasses. Chase 635 



Plant introduction opportunities open to all the Americas, Fairchild 635 



FIELD CROPS. 



The experimental error in field trials, Love 635 



The effect of " place " on yield of crops, Chittenden 635 



The improvement of agricultural crops by selection and hybridization 636 



Furthe- observations on the practical value of line selection, Koch 636 



Relati^ of some morphological characters to lodging, Garber and Olson 636 



The fiffmer and Federal grain supervision, Brown 636 



[Report of field crops work in Michigan, 1918], Cox 636 



[Report of field crops work in Missouri, 1917-18], Etheridge et al 636 



Crop pi'oduction iu the northern sand hills [of Nebraska], Cowan 638 



[Report of field crops work in North Carolina, 1918], Williams 638 



[Report of work with field crgps in Netherlands, 1913-1916], Van Hoek__ 638 



[Field ci'ops work in the Dutch East Indies], Van Breda De Haan 638 



[Report of field crops work in Java, 1916-17], van Rossem 639 



Harvest report [Roseworthy Agricultural College], Colebatch 639 



Sisal and henequeji as binder-tv/ine fibers, Edwards 639 



The vitality of alfalfa seed as affected by age, Headden 639 



The vitaUty of alfalfa roots, MacMillan 639 



A factor analysis of barley, von Ubisch 639 



The growing of beans in Scotland, Malcolm 640 



Cocksfoot. — Its establishment and maintenance in pasture, Cockayne 640 



Some flower anomalies of maize, Lopriore 640 



The old and the new in corn culture, Biggar 640 



" Northerns " cotton, Hilson . 640 



The improvement of " Tinnevellies " cotton, Thomas 640 



Cotton warehousing, Newton and Workman 640 



Crotalaria usaramwnsis as a fiber plant, Bley 640 



Trials of Sudan durra for brewing 641 



[Furcrtea fiber], Lopez 641 



[Proceedings of the National Hay Association] 641 



The retting of hemp : A preliminary note, Carbone 641 



Lolium subulatum, "Wimmera" rye grass, Mullett 641 



New Zealand flax, Ventry 641 



The inheritance of the weak awn in certain Avena crosses, Eraser 641 



Some further experiments with potatoes, Wilson and Chittenden 642 



Potato production, Stewart 643 



