1920] CONTENTS. XIX 



Page. 



Dyar, H. G., Note on the Subgenus Neoculex of Culex 258 



Dyar, H. G., The Mosquitoes of British Columbia and Yukon Territory, 



Canada 258 



Eldredge, I. F., The Management of Hardwood Forests in the Southern 



Appalachians 42 



Elliott, C, Halo Blight of Oats 545 



Fisher, W. S., and A. S. Nicolay, A Mexican Species of Agrilus Found in 



Arizona (Coleoptera) 57 



Frear, W., O. Olson, and H. R. Kraybill, Tobacco Experiments [1915] 533 



Fulton, H. R., Decline of Pseudomonas citri in the Soil 551 



Galloway, B. T., Giant Crown Galls from the Florida Everglades 444 



Galpin, C. J., Farm Life Studies and Their Relation to Home Economics 



Work 595 



Galpin, C. J., The Human Side of Farm Economy 793 



Gibbs, H. D., Problems Investigated at the Color Laboratory, Bureau of 



Chemistry 14 



Gibbs, H. D., The Production of Hydrochloric Acid from Chlorin and 



Water 712 



Gillespie, L. J., Colorimetric Determination of Titration Curves without 



Buffer Mixtures 11 



Gillespie, L. J., Colorimetric Determination of Hydrogen-ion Concentra- 

 tion without Buffer Mixtures, with Especial Reference to Soils 211 



Gillespie, L. J., Reduction Potentials of Bacterial Cultures and of Water- 

 logged Soils 421 



Gnadinger, C. B., Determination of Saccharin in Foods 115 



Godfrey, G. H., Sclerotinia ricini n. sp. Parasitic on the Castor Bean 



{Ricinus communis) 849 



Goldman, E. A., Mammals of Panama 849 



Gould, H. P., Some Principles of Peach Growing 438 



Graves, R. R., A Study of Guernsey Breeding 378 



Griffiths, D., New and Old Species of Opuntia 222 



Guthrie, J. D., Early English Forest Regulations 442 



Hall, M. C, The Adult Tjenioid Cestodes of Dogs and Cats, and of Re- 

 lated Carnivores in North America 80 



Harlan, H. V., Daily Development of Kernels of Hannchen Barley from 



Flowering to Maturity at Aberdeen, Idaho 826 



Harlan, H. V., and S. Anthony, Development of Barley Kernels in 

 Normal and Clipped Spikes and the Limitations of Awnless and Hooded 



Varieties 826 



Harris, J. A., Practical Universality of Field Heterogeneity as a Factor 



Influencing Plat Yields 526 



Harter, L. L., and J. L. Weuner, The Surface Rot of Sweet Potatoes.- 752 

 Hartley, C, R. G. Pierce, and G. G. Hahn, Molding of Snow Smothered 



Nursery Stock 846 



Harvey, R. B., The Relation Between the Total Acidity, the Concentration 



of the Hydrogen-ion, and the Taste of Acid Solutions 11 



Harvey, R. B., Destruction of Zoospores of Plant Disease Organisms by 



Natural Enemies 750 



Hawkins, L. A., The Department of Agriculture Cold Storage Plant 892 



Hawley, L. F., and H. N. Calderwood, jr., Tar-still Operation in Hard- 

 wood Distillation Plants • 717 



Headley, F. B., Unreliable Experimental Methods of Determining the 

 Toxicity of Alkali Salts 814 



