The lessons here outlined are suitable for children of twelve years of
age, and upwards. For younger pupils they would require much adaptation,
and even then they would not be so good as some simpler method, such as
following the growth of one plant, and comparing it with others at every
step. The little ones profit most by describing the very simple things
that they see, without much reference to theories.
The outlines follow the plan of Dr. Gray's First Lessons and How Plants
Grow, and are intended to be used in connection with either of those
books. The necessary references will be found at the end of every section.
The book contains also references to a course of interesting reading in
connection with the subjects of the lessons.
The lessons may begin, like the text-books, with the subject of
Germination, if the seeds are planted before they are required for use,
but it is generally preferable to use the first recitation with the class
for planting the seeds, in order to have them under the direct care of the
pupils. Some general talks about plants are therefore put at the beginning
to occupy the time until the seedlings are ready for study.
Some Nasturtiums (_Tropæolum majus_) and Morning-Glories should be planted
from the first in boxes of earth and allowed to grow over the window, as
they are often used for illustrations.