

viii CONTENTS. 



CONVERSATION XIII. 



THE ACTION OF SOIL ON PLANTS CONTINUED. 

 Improvement of Soil by Amendments ; by Manure. - - 161 



CONVERSATION XIV. 



THE ACTION OF SOIL ON PLANTS CONTINUED. 



Assolements. System of Cropping Simultaneous or in Rotation. Exu- 

 dation of Plants. Natural Forests. Difference of Annual and Pe- 

 rennial Plants. Hoed Crops. Assolements of Trees. Assolements 

 of Belgium and of Tuscany. ... 171 



CONVERSATION XV. 



ON THE MULTIPLICATION OF PLANTS BY SUBDIVISION. 



Two modes of multiplying Plants ; by Seed, and by subdivision. Slips 

 or Layers preserve the peculiar Qualities of the Fruit, tend to diminish 

 the quantity of Seed, and to improve the Fruit. Germs. Three 

 Modes of subdividing Plants: 1. By Layers, various Modes of pro- 

 ducing them. Layers above Ground. Multiplication of Plants by 

 Slips. 189 



CONVERSATION XVI. 



ON GRAFTING. 



The Graft or Scion. Stock. Grafting improves the Quality of the 

 Fruit. Plants of the same Family can alone be grafted on each oth- 

 er: other circumstances requisite. Grafting accelerates the Period 

 of Bearing of Seedling Trees. Mechanical Part of the Process. 

 Three Classes, Untitiges, Omnitiges, Multitiges. Various Modei 

 of Grafting: 1. By Approach; 2. By Scions; 3. By Bourgeons o 

 Buds. - 19* 



CONVERSATION XVII. 



ON THE MULTIPLICATION OF PLANTS BY SEED. 



THE FLOWER. 



Organs of the Flower: Calyx, Corolla, Petals, Nectary, Ovary or Seed 

 Vessel, Carpel, Style, Stigrna, Pistil, Stamens, Filaments, Anthers. 

 Palm Trees. Pedunculus. Torus, Pedicles, Receptacle, Inflores- 



