1920] CONTENTS. HI 



Page. 



IVrtiliziiifr value of reverted phospnorie acid. Haselhoff 428 



'I'lie potasli salt hods of Dallol (Eritrea), (Jiiia 42S 



'I'lic st;itiis (if lime ill soil iiniirovciiu'iit, I'Mpjiiii 428 



Home pnidiirtioii of liiiic by the laniier, Fletcher ■ 428 



ICouiinereiiil fertilizer analyses). Hills et al 428 



Kegistration brands of fertilizer to Au;;ust 1, 1918 428 



.VC.KH ri.TlHAl. UOTANV. 



Hydration and growth. MacDougal 428 



Conipononts aial colloidal beluivior of i)rotoplasni, MacDougal and Spoelir_ 429 



The lixalion of free nilro;;en by trreen plants, W'ann 430 



Nitropbile i)lant formations around manure heap.s, Frcidin 430 



'llie |)rodu(tion of fat in i»lants, liokorny 430 



Cirbon-nitrogen ratio in relation to phint nietal)olism, Gurjar 430 



i'lant ^o-owth, JUiekner 431 



.Mineral constituents of tlie paired seetls of coclilebur, McHargue 431 



The :isli of dune plant.s, Richardson 431 



I Ilhunination and f,'ro\vth |, I{ivera 431 



The influence of lij,dit on some water phints, Schloss-Weill 431 



l{e.s]iinition. ( )sierhout 431 



Climatic control in relation to jjlant gi'owth, TottinKham 4,31 



Observations rej,'ardinj? frost injuiy in West Prussia in 1910-17, Wocke 431 



Studies on frost injury to cereals and lej^umes, Fischer 432 



Significance of manner of thawing for frozen plants, Akerman 432 



Effect of .seasonal conditions on bacteria. Brown and Halversen 432 



Factors intluencing invertase activity of mold spores, Kopeloff and Byall_ 433 



Flagellation of the orgaidsms causing legume nodules, Conn and Breed 433 



Studies in variegation, I, Bateson 433 



On the non-Mendelian inheritance in variegated plants, Winge 433 



Variation in Ahulilon theoi)}irasti, ShuU 433 



A third duplication of generic factors in shepherd's purse, ShuU 434 



FIEI-D CROPS. 



[Work with field crops at North Carolina Station in 1918-19], Willlams__ 434 



(Work with field crops of the Huntley Project Farm in 19181, Hansen 43,5 



I Work with field crops In 1918 of the Newlands Project Farm], Headley 43.5 



Mainienance of pastures and meadows, Stookey 436 



Legume inoculation, V:iss .: 436 



A'arieties of cotton, 1919, Nelson and Hodson 436 



Special cotton growing contest, Girola 4.36 



Flax cidture in the Argentine Republic, Girola 436 



Prevention of sja-outing <iiid greening of potatoes, Schneider 436 



Three centuries of tobacco. Holmes 437 



Farm ja-actices in growing wheat, Arnold and Spafford 437 



hescription of Argentine and introduccfl varieties of wheat, Girola 437 



What the farmer should expect from the seed.sman, Brown 4.37 



Agricultural seed inspection, Hills et al 4.37 



IIOBTICULTUBE. 



[Horticultural investigations on Newlands Project Farm], Headley __ 437 



Methods of growing the morels, Falck 437 



On the fruiting relations of the tomato, Herrmann 437 



The problems of Italian arboriculture, Briganti 438 



The resistance of vines to winter, Diffloth 438 



T.ist of fnuts recommended by the district horticultural societies 438 



The control of diseases and insect pests of fruit trees 438 



Orch.ird management, Blair 438 



Ciininiercial varieties of apples of Canada and the United States, IMacoun_ 438 



The histories of some of our well-known pears. Hooper 438 



Some principles of peach growing. Gould 438 



Good new not well-known varieties of small fruits, Davis 438 



Black currant varieties : A method of classification, Hatton 438 



