XXX CONTENTS. 



jects. Difficulty of following Nature, in adapting the Protecting Pro- 

 perties. Importance of husbanding them, so as to produce the greatest 

 effect, p. 150. — Art of modifying the Effect of Heat and Cold on 

 Woods. Curious points of resemblance between Air and Water. — 

 Places the best laid out always the best sheltered, p. 151. — Fated con- 

 sequences of excluding Cold from full-grown Woods, p. 154. — Selec- 

 tion of Subjects for Underwood. New method of Bush-Planting in the 

 open Park. Protecting the plants not impossible. Pontey, p. 156. — 

 Best sizes of Trees for successful Removal, p. 157. 



SECTION VI. 



PRErARATION OK THE SOIL, FOR OPEN DISPOSITIONS OF TREES, AND 

 CLOSE PLANTATIONS. 



Constituent parts of Soils, Sir H. Davy, Kirwan, Griesenthwaite. 

 Properties of the best possible Soil, p. 159. — Deep Soils particularly 

 favourable to Trees. Vast superiority of Park-wood in England, p. 160. 

 — Theory of the Melioration of Soils. Suq^rising changes worked by 

 Deepening and Pulverizing : by Comminution of the parts, p. 161. — 

 Water and Heat indispensable agents. Theory of Manures. Aeration 

 of Soils. Darwin, Davy, Thomson, p. 163. Superior merit and in- 

 genuity of Tull. Causes of the failure of his system, p. 166. Best 

 methods of Improving soils ; mainly by Intermixture, and following the 

 Chemistry of Nature. Great value of Lime and Peat-Moss. Disco- 

 very of Lord Meadowbank, p. 167. — Ingenuity and Science of the 

 Earl of Dundonald. Dung and Lime Composts seldom prepared with 

 accuracy. Sulphuric Acid an unfortunate Intermixture, p. 169. — Pre- 

 paration of Soils. I. For Single Trees and Open Dispositions of Wood. 

 Proper Composts for different Soils and Subsoils, for Immediate or Fu- 

 ture use, p. 171. — Preparation for Groups and larger Masses. Great 

 value of Trenching, or Double-digging, for promoting Growth, and 

 saving Expense, p. 175. — Its extraordinary Effects on Wood, in the 

 Park and elsewhere; on the Value of Land; in eradicating Rushes. — 

 Vast benefit of a twelvemonth's previous preparation, p. 177. — II. Pre- 

 paration for Close Woods and Plantations. Striking Economy of pre- 

 Tious Trenching. Subsoils far more important than Soils, in all Plant- 

 ing, p. 17SJ. — General view of British Subsoils, as favourable or unfa- 

 vourable to Wood, p. 180. 



