A large lamp chimney with gauze tied over the upper end is useful for inclosing a small plant upon which eggs or insect larvae are developing. The base of the chimney may be thrust an inch into the soil and the development of the larva as it feeds upon the growing plant can be studied. The following are larvae suitable for study and may be found in the places named: The tomato worm on tomato or tobacco plants. (Look for stems whose leaves have been stripped off.) The milkweed butterfly larvae on milkweed, The potato beetle on potato vines, The eastern swallow-tail butterfly on parsnip or carrot plants, The tussock-moth on horse-chestnuts, The promothea moth on lilac bushes, The cabbage-butterfly on cabbage or mustard plants, The red-spotted purple, banded purple, and viceroy butterfly larvae on willow and alder, Cocoons of tussock-moth and tiger-moth under bark, logs, and rubbish in early autumn. Larvae of the emperor-moth (cecropia) may be found wandering about, apparently aimlessly, in September; but they are searching for suitable places for attaching their cocoons to orchard and forest trees. After the leaves have fallen from shrubs and trees, cocoons can be found more easily on the naked twigs or in withered, rolled-up leaves that are fastened by the silk of the cocoon to the branches. Larvae, when placed in the cage, should be supplied with green plant food such as they were found feeding upon, and the pupils should be instructed to observe the chrysalis building or the cocoon weaving. It will be found that some larvae burrow into the soil. During winter the cage should be kept in a cool place, such as a shed, so that the winter conditions may be as nearly natural as possible. In a few cases, the development within the cocoon is quite rapid; and the adult form hatches out in a few weeks, for example, the cabbage-butterfly, monarch or milkweed butterfly, and tussock-moth. For this reason these are preferable for study by Form I pupils. In April the cage should be placed in the school-room, that the pupils may observe the emergence of the insects and the spreading of the wings. The insects can be fed with syrup or honey until they are strong, then the pupils should set them free. Reference.--_Reports of the Entomological Society of Ontario_, Department of Agriculture. PLANT COLLECTIONS The instructions given below for collecting, pressing, and mounting plants are applicable to wild flowers, grains, grasses, and weeds. ~The specimen.~--Select a plant which in form and size is typical of its species and which is in full flower. Care must be taken to dig down and secure the root. If the plant is too large for the mounting sheet, cut out the central part, and use the root, lower leaves, upper leaves, and flower. If the root is very thick, cut slices lengthwise off the sides so as to reduce it to a flat form that is not too bulky.