1919] COIS'TEN'TS. HI 



AGEICULTUBAL BOTANY. 



Page. 



The biological normal spectrum, Raunkiser 428 



Statistical studies on vegetative formations, Raunkiser 429 



The theory of limiting factors, Brown 429 



The origination of ascidla under quasi-experimental conditions, Lloyd 429 



Shrinkage and elongation of Cestnun. nocturnum, Brown and Trelease — 429 



Algological notes. — III, GemonUa lignicola n. sp., Moore 429 



A study of stomata, Rehfous 429 



The tasonomic position of the genus Actinomyces, Drechsler 430 



Morphology of the genus Actinomyces, Drechsler 430 



A comparison of Azotobacter with yeasts, Mulvania 430 



The use of iron in nutrient solution for plants, Corson and Bakkc 430 



Relation of varying degrees of heat to viability of seeds, Burgess 430 



Additional notes on pollination of red clover, Pammel and Kenoyer 430 



Studies on self-terility. — II, Pollen tube growth. East and Park 430 



The behavior of the chromosomes in fertilization. Sax 431 



Segregation of €Enothera brevistylis from (U. lamarckiana, Davis 431 



Twin hybrids of CEnothera hookeri, de Vries 431 



Merrillia, a new rutaceous genus of the tribe Citrese, Swingle 432 



FIELD CKOPS. 



Determining plat yields by square-yard method, Arny and Steinmetz 432 



[Report of field crops work in Nebraska] 433 



Soy beans and cowpeas for North Carolina, Herman 434 



Rotation of potatoes, rye and squashes, onions, oats, and hay, Damon 434 



Varieties of small grains and market classes of wheat, Stewart 434 



Carrying capacity of native range grasses in North Dakota, Shepperd 434 



Baling hay, McClure 435 



Alfalfa on corn-belt farms, Drake, Rundles, and Jennings 435 



Alfalfa in Michigan, Cox 435 



Barley culture in Soutli Dakota, Champlin, Morrison, and Martin 435 



A reason for the contradictory results in corn experiments, Carrier 436 



Factor relations in maize with reference to linkage, Jones and Gallastegui 436 



Structure of the maize ear as indicated in Zea-Euchlpcna hybrids, Collins 436 



Inheritance of waxy endosperm in maize, Kempton 437 



Factors influencing carrying qualities of American export corn, Boerner 438 



Comnmnity cotton improvement in North Carolina, Winters 439 



Potato seed certification in New Hampshire, Prince 439 



Effect of environment on weight and germination of potatoes, Butler 439 



Gigantism in Nicotiana tabacnm and its alternative inheritance, Allard 440 



Behavior of aurea character in a cross of Nicotiana rustica, Allard 440 



Tobacco growing in Ireland, Keller 440 



Blooming and fertilization of wheat flowers, Leighty and Hutcheson 440 



Dry farming for wheat yields : Columbia and Snake River Basins, Hunter_ 442 



Seed Reporter 442 



Seed-testing [in New Zealand], Levy 442 



Plants detrimental to agriculture : Characteristics anc' control, Fron 442 



HORTICULTUKE. 



Protecting American crop plants against alien enemies, Galloway 443 



Report of inspection service, Headlee, Cook, and Weiss 443 



Analyses of insecticides and fungicides. Patten and Berger 443 



Judging vegetables, McLennan 443 



[Variety tests of vegetables at Wisley in 1918] 443 



Standardizing the hamper. Downing 443 



Berry boxes and fruit baskets, Downing 443 



Refrigeration for conseiwing, storing, and transporting fruits, Douane 443 



Varieties of fruits for various localities, Gardner 444 



A report on fruit growing in Denmark, Gram 444 



Some observations on the pruning question. Reed 444 



Pruning and spraying the home orchard and vineyard, Bentley 444 



The commercial apple industry in the United States, Folger 444 



" P. J. Bergius," a new apple vnriety, C. and R. Florin 444 



Minimum temperature sustained by apricot in Pecos Valley, Hallenbeck__ 444 



