How is this long period of solitude and captivity spent? In wandering lazily through the thickness of the oak, in making roads whose rubbish serves as food. The horse in the book of Job “swallows the ground” in a figure of speech: the Capricorn’s grub eats its way literally. With its carpenter’s-gouge—a strong black mandible, short and without notches, but scooped into a sharp-edged spoon—it digs the opening of its tunnel. From the piece cut out the grub extracts the scanty juices, while the refuse accumulates behind him in heaps. The path is devoured as it is made; it is blocked behind as it makes way ahead. Since this harsh work is done with the two gouges, the two curved chisels of the mandibles, the Capricorn-grub requires much strength in the front part of its body, which therefore swells into a sort of pestle. The Buprestis-grub, that other industrious carpenter, adopts a similar form, and even exaggerates its pestle. The part that toils and carves hard wood requires to be robust; the rest of the body, which has but to follow after, continues slim. The essential thing is that the implement of the jaws should possess a solid support and powerful machinery. The Capricorn larva strengthens its chisels with a stout, black, horny armour that surrounds the mouth; yet, apart from its skull and its equipment of tools, this grub has a skin as fine as satin and as white as ivory. This dead white is caused by a thick layer of grease, which one would not expect a diet of wood to produce in the animal. True, it has nothing to do, at every hour of the day and night, but gnaw. The quantity of wood that passes into its stomach makes up for the lack of nourishing qualities. The grub’s legs can hardly be called legs at all; they are mere suggestions of the legs the full-grown insect will have by and by. They are infinitesimal in size, and of no use whatever for walking. They do not even touch the supporting surface, being kept off it by the plumpness of the chest. The organs by means of which the animal progresses are something altogether different. The grub of the Rose-chafer, with the aid of the hairs and pad-like projections upon its spine, manages to reverse the usual method of walking, and to wriggle along on its back. The grub of the Capricorn is even more ingenious: it moves at the same time on its back and its stomach. To take the place of its useless legs it has a walking apparatus almost like feet, which appear, contrary to every rule, on the surface of its back.