This museum lasted several years; and the next spring, Rollo made his collection of flowers, which was larger than Lucy's. Mary helped him about it. At first, he was going to have it in a larger book; but Mary thought it would be better to have all the books of a size, and then they would lie together very compactly, in a pile; which would not be the case if they had several books of different sizes. She said if any one wanted to make a larger collection, he had better have several volumes. Rollo made volume after volume, until at last his collection consisted of six. There was one collection of _leaves_; Henry made it. His object was to see how many different-shaped leaves he could get. He did not regard the little differences which exist between the leaves of the same tree, but only the essential differences of shape; such as between the leaf of the oak and of the maple. Two or three pages were devoted to leaves of forest-trees, and they looked very beautiful indeed. Leaves, being naturally flat, can be pressed very easily, and they generally preserve their colors pretty well. One page was devoted to the leaves of evergreens, such as the pine, fir, spruce, hemlock; and they made a singular appearance, they were so small and slender. A little sprig of pine leaves was put in the centre, and the others around. Then there were the leaves of fruit-trees and plants, such as the apple, pear, peach, plum, raspberry, strawberry, currant, gooseberry, &c., arranged by themselves; and there were half a dozen pages devoted to bright-colored leaves, gathered in the autumn, after the frost had come. These pages looked very splendidly. The names of the plants to which all these leaves belonged were written under them, and also the name given by botanists to indicate the particular shape of the leaf; these names the children found in books of botany. Such, for instance, as _serrated_, which means notched all around the edge with teeth like a saw, like the strawberry leaf; and _cordate_, which means shaped like a heart, as the lilac leaf is, and many others.