Architect and engineer . le of the insect at some weak or accessible link, as by preventing or re-pelling the invasion of the primary pair ofreproductives, or poisoning out the inci-pient colony. Characteristic Types of TermitesTermites fall into two major habit types:wood-dwelling termites and earth-dwell-ing termites. Wood-dwelling termites con-fine themselves to wood, the whole colonybeing contained in the wood. Most wood-dwelling termites attack only dry, soundwood and are known as dry-wood termites are of several dif-ferent types. Of these the group which isby far
Architect and engineer . le of the insect at some weak or accessible link, as by preventing or re-pelling the invasion of the primary pair ofreproductives, or poisoning out the inci-pient colony. Characteristic Types of TermitesTermites fall into two major habit types:wood-dwelling termites and earth-dwell-ing termites. Wood-dwelling termites con-fine themselves to wood, the whole colonybeing contained in the wood. Most wood-dwelling termites attack only dry, soundwood and are known as dry-wood termites are of several dif-ferent types. Of these the group which isby far the most important from the eco-nomic point of view is known as the sub-terranean termites. They live in the earthand in wood in contact with the earth, andfeed upon wood placed in or on the groundand from such wood as a center extendtheir attacks to wood removed from groundcontact. In some cases they build tubesor covered ways from their galleries in the THE ARCHITECT AND ENGINEER ^ 38 ? FEBRUARY. NINETEEN THIRTY-FOUR. Fig. 5—Runways, tubes and towers made by subterranean tennuos underhouses. Top—Branched tubes originating from a wood spreader embedded inconcrete foundation. Wood forms had been left on the outside concrete wallof the building, which was only two and a half years old. Center—Towersof the western subterranean termite. Bottom—Towers and tubes of the west-ern subterranean termite, from a stump left under a house. THE ARCHITECT AND ENGINEER ^ 39 ? FEBRUARY, NINETEEN THIRTY-FOUR EMERGING WINGEDREPR0DUCTIVE5
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