8 
CONTENTS. 
Lesson IV.—Clay .page 37 
Lesson V.—Carbonate of Lime. 39 
Lesson VI.—Plaster, Marl, Magnesia, Iron. 41 
Lesson VII.—The Organic Parts of the Soil. 43 
Lesson VIII.—The Formation of Humus, and its Properties.46 
Lesson IX.—The Action of Humus in the Soil..... 48 
CHAPTER H. 
The Physical Properties of Soil. 
Lesson X.—Texture and Depth of the Soil.....51 
Lesson XI.—Situation of the Surface. 53 
Lesson XII.—Subsoil.54 
Lesson XIII.—The Effects of Climate on Vegetation...56 
Lesson XIV.—The Effect of Climate upon Cultivation and upon Animal 
Economy.58 
PART THIRD. 
CHAPTER I. 
Ameliorators. 
Lesson I.—General Views of Manures, Ameliorators, and Stimulants.... 61 
Lesson II.—Liming Lands, or the Use of Lime as an Ameliorator.63 
Lesson 1IL—Liming Lands (continued). 65 
Lesson IV.—Liming Lands (continued).66 
Lesson V.—Marl as an Ameliorator. 69 
Lesson VI.—Marl as an Ameliorator (continued). 71 
Lesson VII.—Clay and Sand as Ameliorators...73 
CHAPTER II. 
Stimulants. 
Lesson VIII.— Ashes ......76 
Lesson IX.—Plaster. .... 78 
Lesson X.—Paring and Burning...79 
CHAPTER IH. 
Manures. 
Lesson XI.—Formation, Composition, and Action of Manures.81 
Lesson XII.—Manures (continued).... 89 
’ Lesson XIII.—Litter, and Liquid Manures...84 
Lesson XIV.—Management of Manure.. 85 
Lesson XV.—Varieties of Manure....87 
Lesson XVI.—Folding Sheep—Animalized Manures. 88 
Lesson XVII.—Vegetable Manures.90 
