1917] CONTENTS. lU 



Page. 



The action of superphosphate in tests in 1913, Geerte 426 



The extraction of potash from silicate rocks, II, Ross 427 



Potash from Canadian feldspar, Benham 427 



Report on wood and plant ashes as a source of potash, Berry 427 



[Liming and manurial experiments] 427 



The effect of fineness of division of pulverized limestone, Kopeloff 428 



Limestones of Michigan, Smith 428 



Agricultural lime, Miller and Krusekopf 428 



Tabulated analyses of agricultural lime 428 



Inspection of commercial fertilizers, 1916, Trowbridge 428 



[Commercial fertilizer analyses] 429 



Fertilizer registrations for 1917, Cathcart 429 



AGRICULTURAL BOTANY. 



Periodicity in transpiration, Wilkie 429 



Comparison of the hourly evaporation rate of atmometers and free water surfaces 



with the transpiration rate of Medicago sativa, Briggs and Shantz 429 



Oxidase activity of plant juices and hydrogen ion concentrations, Bunzel 429 



Evidence of action of oxidases within the growing plant, Kastle and Buckner. . 430 



Occurrence and significance of flavone derivatives in plants, Shibata et al 4.30 



The acidity of plant cells as shown by natural indicators, Haas 4.30 



Gennination of seeds of LepicHum sativum in solutions of electrolytes, Lesage. 431 



The influence of different media on the histology of roots, Wilkie 431 



The permeability of living cells to acids and alkalies, Haas 431 



Salt antagonism in gelatin, Fenn .^ 431 



Similarity in the behavior of protoplasm and gelatin, Fenn 431 



Tolerance of fresh water by marine plants, Osterhout 431 



Copper in the flora of a copper-tailing region, Bateman and Wells 432 



Models to illustrate segregation and combination, Chibber 432 



The probable error of a Mendelian class frequency, Pearl 432 



Note on the inheritance of crossability. Backhouse 432 



The results of hybridization in Salix, Ikeno 432 



Evolution by means of hybridization, Lotsy 432 



The bearing of some general biological facts on bud variation. East 433 



Mendelian factor difference v. reaction system contrasts, Goodspeed and Clausen . 433 



CEnothera mutants with diminutive chromosomes, Lutz 433 



Root cuttings, chimeras, and sports, Bateson 434 



Faciation in Pharhitis hederacea, Yamaguchi 434 



Plant succession. — An analysis of the development of vegetation, Clements. . . 434 



Polar bear cacti, Cook 434 



Vegetation of the Pinus tseda belt of Virginia and the Carolinas, Harper 435 



Meadow vegetation in the montane region of northern Colorado, Reed 435 



Taxonomic botany and the Washington botanist, Hitchcock 435 



FIELD CROPS. 



Forage and root crops. Knight 435 



Field crops for late planting. Knight 436 



[Field crops] 436 



[Field crops], Nobbs 436 



[Field experiments], De Jong and van Rossem 436 



[Field crops] 436 



[Registration of varieties], Montgomeiy, Williams, and Hayes 437 



[Field crops] 437 



[Field crops] 437 



Dry farming in Colorado, Kezer 437 



Grasses under drought conditions at Hawkesbury Agricultural College, Kerle . . 437 



Artificial reseeding of range lands, Sampson 437 



Cereal experiments, Tonnelier 438 



Seed grain inspection and crop reports, 1915-16, Garland 438 



Some effects of legumes on associated nonlegumes, Evans 438 



Soy beans and cowpeas in Illinois, Burlison and Allyn 438 



The dry-matter content of field-cured and gi'een forage, Arny 439 



Alfalfa in Kansas, Doyle et al 439 



[Alfalfa], Graber and Johnson 440 



