San Francisco : Architect and Engineer, Inc · leaf 402
water solubleextractive in redwood has been found torange from 5.45 to 28.23 per cent of thedry weight of the wood. These tests sug-gest the advisability, when purchasingnaturally resistant wood, of requiring, as attack such wood from which this oil hasbeen evaporated by weathering. The re-moval of… … Fig. 15—Photographs ot a pair of primary reproductives of Kalotermesminor (dry-wood termite) and the work of newly established pairs, (a)Three recently excavated royal cells cut open, the two lower showing out-lines of the cells. At right are two (dark) entrance holes, about one-halfnatural size,…
Architecture · Building
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