CONTENTS 
LECTURE I. Page 
Introduction. General Views of the Objects of the Course, 
and of the Order in which they are to be discussed - 3 
LECTURE II. 
Of the general .Powers of Matter which influence Vege- 
tation; of Gravitation, of Cohesion, of Chemical At- 
traction, of Heat, of Light, of Electricity, ponderable 
Substances, Elements of Matter, particularly those 
found in Vegetables, Laws of their Combinations and 
Arrangements - - - - 29 
LECTURE III. 
On the Organization of Plants. Of the Roots, Trunk, and 
Branches ; of their Structure. Of the Epidermis. Of 
the cortical and alburnus Parts of Leaves, Flowers, 
and Seeds. Of the chemical Constitution of the Organs 
of Plants, and the Substances found in them. Of 
mucilaginous, saccharine, extractive, resinous, and oily 
Substances, and other vegetable Compounds, their 
Arrangements in the Organs of Plants, their Com- 
position, Changes, and Uses - - - 53 
LECTURE IV. 
On Soils : their constituent Parts. On the Analysis of 
Soils. Of the Uses of the Soil. Of the Rocks and 
Strata found beneath Soils. Of the Improvement of 
Soil - - - - - » 141 
