On examining this preparation under the microscope, it is seen that three of the joints are greatly expanded, and that the whole of their under surface is covered profusely with certain wonderful projections, which are known to act as suckers. One of them is exceedingly large, and occupies a very considerable space, its hairs radiating like the rays of the heraldic sun. Another is also large, but scarcely half the diameter of the former, and the remainder are small, and mounted on the extremities of delicate foot-stalks, looking something like wide-mouthed trumpets. In the specimen from which the drawing was taken the smaller suckers are well shown, as they protrude from the margin of the foot. One of the larger suckers is seen more magnified on Fig. 14. Plate VIII. Fig. 1, exemplifies the manner in which the muscles of insects do their work, being well attached in the limbs to the central tendon, and pulling “with a will” in one direction, thus giving very great strength. This leg is taken from the water boatman (_Notonecta_), and has been mounted in Canada balsam. On Plate VII. Fig. 29, may be seen a curiously formed creature. This is the larva of the tortoise beetle (_Cássida_), the skin having been flattened and mounted in Canada balsam. The spiracles are visible along the sides, and at the end is seen a dark fork-like structure. This is one of the peculiarities of this creature, and is employed for the purpose of carrying the refuse of its food, which is always piled upon its back, and retained in its place by the forked spines, aided probably by the numerous smaller spines that project from the side. Fig. 33 shows part of the stomach and gastric teeth of the grasshopper. This structure may be seen to perfection in the “gizzard,” as it is called, of the great green locust of England (_Ácrida viridíssima_). The organ looks like a sudden swelling of the œsophagus, and when slit longitudinally under water, the teeth may be seen in rows set side by side, and evidently having a great grinding power. The common house cricket has a similar organ of remarkable beauty. Just above (Fig. 27) is the corresponding structure in the hive bee, three of the teeth being shown separately at Fig. 28. * * * * * We now cast a rapid glance at the wings of insects.