CONTENTS. 
EMTRODUCTION 25: iecccice saves ensteccssacsisaes: sasataissetaratseeestesewe sea onl 
DIVISION L 
THE ATMOSPHERE AS RELATED TO VEGETATION. 
CHAPTER I. 
ATMOSPHERIC AIR AS THE Foon oF Puanrs. 
§ 1. Chemical Composition of the Atmosphere 
§ 2. Relation of Oxygen Gas to Vegetable Nutrition 
§ 3. “ Nitrogen Gasto “ 
§ 4 « —_“ Atmospheric Water to Vegetable Nutrition... 
§ 5. “ Carbonic Acid Gas. * “ 
§ 6. e ‘¢ Atmospheric Ammonia to “ 
Ge Ts MOBO bieisisssincie siceiaid cic denis rade serene ban eaeee aineisia pion eee Ca poe ay 63 
§ 8. Compounds of Nitrogen and Oxygen in the Atmosphere................. Kt) 
§ 9. Other Ingredients of the Atmosphere..............cececee 0 ceeseeeeeees ot 
§ 10. Recapitulation of the Atmospheric Supplies of Food to Crops........... 94. 
§ 11. Assimilation of Atmospheric Food.............. 0... aiisivible © afetrcie aisivie: 7 
§ 12. Tabular View of the Relations of the Atmospheric Ingredients to the 
Life OF PIANts a)... cc csiccasice: ware sewed wawees onsen a eedceda tides seme OS 
CHAPTER II. 
Tur ATMOSPHERE AS PHYSICALLY RELATED TO VEGETATION. 
§ 1. Manner of Absorption of Gaseous Food by Plants........ daden gee ssiveusens 99 
DIVISION I. 
THE SOIL AS RELATED TO VEGETABLE PRODUCTION. 
CHAPTER I. 
INTRODUCTORY........... POLO RCM ICE OO Cor is eeakew eens LOE 
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