Fig. 15 is the lower portion of the many-jointed legs of the long-legged spider (_Phalángium_), the whole structure looking very like the antenna of the cricket. Fig. 17 is the leg of the glow-worm, showing the single claw with which it is armed. Fig. 26 shows the foot of the flea, furnished with two simple claws. Fig. 16 is the foot of the Trombídium, a genus of parasitic creatures, to which the well-known harvest-bug belongs. Fig. 26, Plate VI., shows the leg of the green Aphis of the geranium, exhibiting the double claw, and the pad or cushion, which probably serves the same purpose as the pads found upon the feet of many other insects. Fig. 8 is the lower portion of the leg of the ant, showing the two claws and the curious pad in the centre, by means of which the insect is able to walk upon slippery surfaces. The Típula has a foot also furnished with a single pad (see Plate VI. Fig. 30). This organ is seen under a very high power to be covered with long hair-like appendages, each having a little disc at the end, and probably secreting some glutinous fluid which will enable the creature to hold on to perpendicular and smooth surfaces. Many of my readers will doubtless have noticed the common fly, towards the end of autumn, walking stiffly upon the walls, and evidently detaching each foot with great difficulty, age and infirmity having made the insect unable to lift its feet with the requisite force. Fig. 21 is the foot of one of the ichneumon-flies (_Ophíon_), the hairy fringe being apparently for the purpose of enabling it to hold firmly to the caterpillar in which it is depositing its eggs, and which wriggles so violently under the infliction that it would soon throw its tormentor had not some special means been provided for the purpose of enabling the latter to keep its hold. Fig. 20 is a beautiful example of a padded foot, taken from the little red parasitic creature so plentifully found upon the dor or dung beetle (_Geotrúpes_), and of which the afflicted insect is said to rid itself by lying on its back near an ant’s nest, and waiting until the ants carry off its tormentors. Fig. 18 is the foot of the common yellow dung-fly (plentiful in pasture lands), having two claws and two pads; and Fig. 19 shows the three pads and two claws found in the foot of the hornet-fly (_Ásilus_). Few microscopic objects call forth such general and deserved admiration as the fore-foot of the male water-beetle (_Dytiscus_), when properly prepared and mounted, for which see Fig. 13.