been introduced into the text in
the belief that they will make the work more interesting to the
general reader, and will aid the student in learning to make simple
investigations for himself.

The author recommends all who use the book to perform the experiments
and to make the observations, and so come actively in touch with the
work.

The observations begin on the farm. The author considers the plant the
central and all-important factor or agent on the farm.

The root is regarded as the most important part of the plant to
itself, and consequently to the plant grower.

The general truths or principles which state the conditions necessary
for the growth and development of plant roots are regarded as the
foundation truths or fundamental principles of all agriculture. These
truths are as follows:

The roots of farm plants need for their best growth and development:

A firm, mellow soil.

A moist soil.

A ventilated soil.

A warm soil.

A soil supplied with plant food.

The first two chapters lead the reader quickly through logical
reasoning to these fundamental truths, on which the remainder of the
work is based.

A study of soils is made in connection with the root studies, as the
two are so closely related.

After the study of roots and soils the other parts of the plant are
considered in the order of their importance to the farmer or plant
grower. The aim is always to get at fundamental facts and principles
underlying all agricultural and horticultural practice.

The author regards the conditions necessary to root growth and
development as the important factor constituting soil fertility, and
in the last ten chapters takes up the discussion of certain farm
operations and practices and their effects on these necessary
conditions, and consequently their effect on the fertility of the
soil.

The author extends gratitude to all who have in any way assisted in
the preparation of this book, whether through advice, preparation of
the text, preparation of the illustrations, or any other way in which
he has received assistance.

C.L. GOODRICH.

GLENNDALE,
Prince George Co., Maryland,
_January_ 21, 1905.

CONTENTS

PART I

GENERAL PRINCIPLES UNDERLYING PLANT CULTURE

Chapter Page

I.--INTRODUCTION TO PLANTS 3

II.--ROOTS 9
Us