Let them examine the bark of the trunk and describe its colour and roughness. The fissures in the bark, which are caused by the enlarging of the tree by the formation of new wood under the bark, are deeper at the bottom of the tree than at the top, the tree being younger and the bark thinner the nearer to the top we go.
Let the pupils look up into the tree from beneath and then go a little distance away and look at it. They will notice how bare the branches are on the inside, and the teacher will probably have to explain why this is so. They will discover that the leaves are nearly all out toward the ends of the branches as they get light there, while the centre of the tree top is shaded, and the great question that every tree must try to solve is how to get most light for its leaves. The pupils will now see an additional reason why the lower limbs should be longer than the upper ones. The greater length of the lower limbs brings the leaves out into the sunlight.
The reason for calling this tree an "evergreen" may now be considered. Why it retains its leaves all winter is a problem for more advanced classes; but if the question is asked, the teacher may get over the difficulty by explaining to the class that the leaves are so small, and yet so hardy, that wind, frost, or snow does not injure them. Each pupil may bring a small branch or twig back to the school-room for use in a class-room lesson.
CLASS-ROOM LESSON
Materials.—Small branches—one for each pupil, cones, bark, pieces of pine board.
Introduction.—Review the general features of the pine that were observed in the field lesson.
Observations.—The branches are distributed. Pupils test the strength and suppleness of the branches and find the gummy nature of the surface.
Of what value are these qualities to the tree during winter storms?
Examine the texture, stiffness, and fineness of the needles.
Note that the needles are in little bunches. How many are in each bunch?