x ii TABLE OF CONTENTS. 



BOTANY Continued, 



History of ffeliantkus tuberomu Page 338 



Living and Fossil Oaks of Europe 339 



Rapid Growth of Fourcroya 339 



Exhalation in Lichens 340 



Vitality of < irain 340 



Fluorescence of Calycanthns 340 



The Effect of Frost on Chlorophyl Granules 341 



I . (Feet of Frost on Evergreen Leaves 341 



The Wood-Oil Tree 341 



( ';ip< rus aeult ntua 342 



The Prickly Tear 342 



1 ' lisonous Grasses 343 



History and Uses of Jaborandi 343 



Vegetable Eider-Down 344 



Charcoal for Gunpowder 344 



Homogonous and Ileterogonous Flowers 345 



Three Feet of Fern-Spores 345 



Vegetable Poisons of Samoa 346 



Sarraa nia variolaris ^6 



Fertilization of Gentiana Andreicsii 348 



AGRICULTURE AND RURAL ECONOMY. By Professor W. O. At- 



water, Wesleyan University, Middletown, Conn 349 



Agricultural Experiment Stations 349 



Growth of the Experiment Stations 349 



Resources, Appliances, and Work of the Experiment Stations 350 



The Atmosphere as Related to Vegetation 352 



Nitrogen Compounds Brought to Soil by Snow 352 



Influence of Forests upon Rainfall and Temperature 352 



The Soil in its Relations to Vegetable Production 353 



Agricultural Geology 353 



New Jersey Marls 353 



Percolation of Water through the Soil, and Consequent Loss of 



Plant-Food .354 



Loss of Plant-Food through Rivers 354 



Soil-Absorption 355 



The Causes of Soil-Absorption 356 



The Absorption of Bases by the Soil 350 



( Oxidation of Nitrogen Compounds in the Soil 357 



Sources and Functions of Ingredients of Plant-Food 358 



The Sources of the Nitrogen of Vegetation 358 



Sources of Nitrogen Removed from the Soil by Crops without Ni- 

 trogenous Manure 358 



Leguminous ( Irops and Soil Nitrogen 359 



