II CONTENTS. IVol. 36 



Pag*. 



Kelative oil yield of Florida oranges, Hood 207 



Studies on tlie extraction of rosin from wood, I, Palmer and Boelimer 207 



A numerical expression for color, Kress and McNaughton 207 



METEOROLOGY. 



The problems of agricultural meteorology, Azzi 207 



CUmatological data for the United States by sections 207 



Annual report of the Weather and Crop Service for 1915, Chappel 207 



Meteorological record, 1915 208 



The phenology of Nova Scotia, 1915, MacKay 208 



[Results of meteorological and soil temperature observations], Eambaut 208 



Swedish meteorological observations, 1914 208 



The distribution of precipitation in north Germany, Hellmann 208 



Thunder and hail in the region of Paris, Angot 208 



The climate of western and equatorial Africa, Chudeau 208 



Correlation of rainfall and the succeeding crops in the Punjab, Jacob 209 



The cUmatic control of Australian production, Taylor 209 



SOILS — FERTILIZERS. 



The present status and future development of soil classification, Coffey 210 



Field operations of the Bureau of Soils, 1913, Whitney et al 210 



[Soil analyses] 210 



Water penetration in gumbo soils of Belle Fourche Project, Mathews 210 



Freezing point method for acidity and lime requirement of soils, Bouyoucos. . . 210 



The organic phosphorus of soil. Potter and Benton 212 



The effects of certain organic compounds on plant growth, Funchess 212 



Physiological balance of nutrient solutions in sand cultures, McCall 212 



Comparison of field with laboratory experiments in soil biology, Koch 213 



Sources of error in soil bacteriological analysis, Lint and Coleman 214 



Action of carbon black and similar materials in soils. Skinner and Beattie. . . . 214 



Soil fungi and their activities, Waksman 214 



Azotobacter in Hawaiian soils, Burgess 215 



En\dronmental factors influencing the actiAdty of soil fungi, Coleman 215 



Effect of time and depth of cultivating on bacterial activity, Gainey 215 



Studies on the activity of soil protozoa, Koch 216 



The increase of nitrogen in fermenting manures, Tottingham 217 



The action of barnyard manure and commercial fertilizers, Wagner 217 



Experiments with humogen and heated peat, Gimingham 219 



Absorption of the nitrogen in ammonium sulphate. Van Harreveld-Lako 219 



Phosphate rock in 1915, Phalen 219 



The conservation of phosphate rock in Tennessee, Phalen 220 



The limestones of the Canterbury Province. Speight 220 



Sodium chlorid as a fertilizer, BoUn 220 



Fertilizer experiments with manganese dioxid on grain, Ricci and Barbera. . 220 



How to remedy the scarcity of fertilizers, Mifege 220 



Buying and using fertilizers, Salter 220 



AGRICULTURAL BOTANY. 



Rolliniopsis, a new genus of Annonaceae from Brazil, Safford 220 



The occurrence of bacteria in frozen soil, Harder 220 



Incubation studies with soil fungi, Waksman and Cook 221 



The inoculation and incubation of soil fungi, Kopeloff 221 



On paii's of species. Gates - ■ ■ ■ 221 



Development of the primordial leaves in teratological bean seedlings, Hajris. . 221 



The dependence of mutation coefficients upon external conditions, de Vries. . . 222 



The wood structure of (Enothera stenomeres and gigas, Tupper and Bartlett. ... 222 



Anthocyanin markings and cell mutation, Kiister 222 



The differentiation of starches of parent stock and hybrids, Reichert.^ 222 



Notes on the anatomy of the young tuber of Ipomosa batatas, McCormick 223 



The rest period in the tubers of Solanum tuberosum, Appleman 223 



The vitality of seeds passed by cattle, Milne 223 



The roots of herbaceous plants, Modestov - , 223 



Stomatal structure and function in Camellia ( Thea) japonka, Heilbronn 223 



The periodicity and distribution of radial growth in trees, Grossenbacher 223 



