_To the teacher._--The brown colour of the bud makes it an absorbent of sunlight, and also serves as a protection from observation by the sharp eyes of bud-eating birds. The gummy scales are waterproof, and the scales, by spreading open gradually, cause the waterproof property to be retained even after the bud has grown quite large. The inner part of the bud is composed of two, four, or six tiny leaves folded up and supported on a short bit of stem. Some of the buds have, in addition to leaves, a tiny young flower cluster. All of these things are densely covered with white down. The down is the fur coat to protect the tender parts from the cold. REVIEW LESSON Review the lesson on buds, but substitute buds of the lilac or apple for the horse-chestnut buds of the original lesson. CORRELATIONS The observational study of the buds and twigs is a good preparation for busy work in art and manual training, and the pupils may be assigned exercises, such as charcoal drawing of a horse-chestnut twig, paper cutting of a lilac twig and buds, clay or plasticine modelling of twigs and buds. For oral and written language exercises, enlarge the vocabulary of the pupils by requiring sentences containing the words--scales, twigs, buds, protection, terminal, lateral, leaf stalk, blade, etc. LEAVES Leaves, because of their abundance and the ease with which they may be obtained, are valuable for Nature Study work. It is possible to arouse the interest of even young children in the study of leaves, but care must be taken not to make the observation work too minute and the descriptions too technical for the primary classes. FIELD EXERCISES An excursion to the school grounds or to some neighbouring park will suffice to bring the pupils into direct contact with the following plants: a maple tree, a Boston ivy (or other climbing vine), a nasturtium, a geranium. Ask the pupils to find out where and how leaves are placed on each of these plants, that is, whether they are on the inner parts of the branches of the tree or out at the ends of the branches. Do the leaves overlap one another or does each make room for its neighbours? Are the leaves spread out flat or curled up? What holds the leaves out straight and flat? What do the leaves need to make them green and healthy? Are the leaves placed in the right way, and are they of the right form to get these things?