IV CONTENTS. [Vol. 38 



Page. 



The pine tree of north Sweden, Sylveu 447 



I Rubber cultivation and rubber preparation] 447 



On a new essence from Blcpharocalyx gigantca, Zclada 447 



Pulp wood consumption and production, 1916, Smith and Helphenstine, jr. . . 447 



DISEASES OF PLANTS. 



The relation of som.e rusts to the physiology of their hosts, Mains 448 



Origin and development of the galls produced by two cedar rust fungi, Weimer. 448 



The genus Citromyces, Pollacci 448 



Mycological notes, Lendner 448 



Diseases and injuries of cultiA'ated plants during 1912 448 



Grain smut in Java, van Hall 448 



The prevention of Inmt, Darnell-Smith 448 



Pod blight of the Lima bean caused by Diaporllie phaseoloruvi, Harter 449 



Cucumber scab caused by Cladosporium cucumennum, Doolittle 449 



Flax wilt: A study of nature and inheritance of A\dlt resistance, Tisdale 449 



Resistance to fungicides shown by hop mildew (Sphserotheca humuli), Salmon. 450 



Neck rot disease of onions, Munn 450 



Onion neck rot i)i storage houses, Hall 451 



Early blight of potato and related plants, Rands 451 



A bacterial disease of soy bean and natiu'e of root nodules, van der Wolk 452 



Orobandie ramosa and 0. cumana, parasites of tobacco in Roumania, Giintescu. 452 



Dying of young fruit trees. Waters 452 



An undescribed bark canker of apple and the associated organism. Coons 453 



A blossom wilt and canker of apple trees, W^ormald 453 



The blossom wdlt and canker disease of apple trees, Wormald 453 



The gnarly apple disease of 1914, Venal^le 453 



Effect of fungicide on spore germination of Alternaria, Goss and Doolittle 453 



Lime as a preventive and remedy for gummosis and l^rown rot, Faulkner 454 



The fig canker, caused by Phovia cineresccns, Salmon and Wormald 454 



Temjieratures of cranberry regions in relation to growth of fungi, Stevens 454 



Orange rusts of Rubus, Ajrthur 454 



The efficacy of Bordeaux mixture, Vermorel 454 



Report on fungus rot [of avocado]. Home 454 



Citrus scab in Porto Rico, Stevenson 454 



Brown spot of Emj^eror mandarins, Darnell-Smith 455 



Walnut blight in the eastern United States, McMm'ran 455 



Narcissus disease, Ramsbottom 455 



O'idium qu.ercinum on chestnut. Trotter 455 



An epidemic of Cronartium comptonise, Kauff man and Mains 455 



[Rubber diseases], Anstead 456 



Abnormal leaf fall of Hevea rubber, Anstead 456 



ECONOMIC ZOOLOGY — ENTOMOLOGY. 



Principles of economic zoologj^ Daugherty 456 



Game laws for 1917, Lawyer, Bancroft, and Eariishaw 456 



Laws relating to fur bearing animals, 1917, Lantz 456 



Control of the jack rabbit pest in Nevada, Ward 456 



Control of the California ground squirrel, Dixon 456 



Handbook of Vjirds of the Vv'estem United Slates, Bailey 457 



Notes on North American birds, 0))erholser 457 



Notes on the genus Puffinus, Oberliolser 457 



The shedding of the stomach lining by birds, particulary Anatidse, McAtee. . . 457 



The food of nestling birds, Enders and Scott 457 



English sparrow feeding on larva of elm-tree beetle, Wilmot 457 



[The attraction and protection of birds], Forbush 457 



Hydrocyanic acid gas as a soil fumigant, de Ong 457 



Ventilation after fumigation of ships with hydrocyanic acid gas, Grubbs 458 



Fumigation hints ~. ! 458 



Effect of smelter gases on insects, Doane 458 



The natural immunity orresistance of plants to insect attack, Treherne 458 



Some problems of sex ratios and parthenogenesis, WilUams 458 



