MANUAL OF NATURE STUDY. 
133 
Then which would be best for the root? The move¬ 
ment of the root is so very slow that we cannot see 
it move. We cannot see a plant grow; but we know 
that it does grow, for we can measure it at different 
times and prove it to be true. So, too, we- may 
measure the movement of a plant around a common 
axis. Erect a stationary wire or wooden frame around 
a growing plant, say a corn-stalk, being careful not 
to let the frame touch the plant in any way. Let 
the frame rest upon the ground and support a ring 
two or three inches in diameter, encircling the apex 
of the plant. Measure from time to time the dis¬ 
tance of plant from the ring and it will be found to 
vary. At one time nearer the north, then east, 
south and west, until it comes around to the north 
again. These measurements and records, if correct, 
will prove the circumnutation of growth. Try 
other plants in same way. 
The Fern. 
Upon what sort of soil do ferns grow ? Do you 
always plant them in Irfie shade ? Why ? 
Examine the blades, or fronds, and learn to de¬ 
scribe them. Draw several fronds, being particular 
to represent all their parts. Where is the stem 
out of which these blades grow? The stem is an 
underground rootstock or rhizome, somewhat like 
iris, Solomon’s seal, calamous or rhubarb. Notice 
