The eggs may also be found on the surface of ponds or open rain barrels, and may be transferred to water in a jar in the laboratory. STUDY OF THE ADULT FORM Note the shape, colour, sucking tube, wings, and legs. Compare with the house-fly. Distinguish the male insect from the female; the former has feathery feelers, and has mouth parts unsuited for biting. How many kinds of mosquitoes have you seen? Direct attention to the kind which causes the spread of malaria. It is recognized by its habit of standing with its body pointing at right angles to the surface on which its feet are placed or, in other words, it appears to stand on its head. THE DEVELOPMENT Describe the egg raft. Observe the wigglers (hatched in about a day); the divisions of the body of the wigglers; position of the wigglers when at rest. Observe that the tail end is upward. Lead the pupils to perceive that this is the means of getting air. Observe the rapid movement toward the bottom when disturbed; the means of causing this movement; the change into the large-headed pupae--a change which takes place about ten days after hatching; the almost motionless character of the pupae; the change from the pupae forms into the adult--a change which takes place at about the fourth day of pupae life. Put some mosquito larvae (wigglers) into the fish aquarium. Are mosquitoes of any use? The wigglers are the food on which some young fishes live. Young bass and trout feed upon them. Put some kerosene on the surface of a jar in which there are mosquito larvae. Describe a method of destroying mosquitoes. The teacher tells about the mosquito as the cause of the spread of malaria. From the fact that the eggs hatch on stagnant water, deduce a benefit arising from the draining of land. REFERENCES Silcox and Stevenson: _Modern Nature Study_ Hodge: _Nature Study and Life_ CADDICE-FLY Time: May. The caddice-flies are very interesting insects, owing to the habits of the larvae of building little cases of wood, stones, or shells, in which they pass their development stages under water. These larvae are easily found during the month of May in little streams of water everywhere throughout the Province. Look for what at first sight appears to be a bit of twig or a cylinder of stone about an inch long moving along the bottom as though carried by currents. Closer observation will result in the discovery that this is a little case composed of grains, of bits of stick, or of sand and tiny shells, and the head of the occupant may be seen projecting from one end. Collect some of these larvae in a jar of water and transfer them to the aquarium. Direct the pupils to look for others in the streams, so that they may observe their appearances and movements in their natural environment. If kept in jars, the water must be changed every day, and the top should be covered to prevent the escape of the adults.