Creosoted timer . than its actualsize, a picture of a fragment of wood split from a branchw^hich had been bored by small teredos, showing longitudi-nal sections of two borings, and showing in the upper of thetwo borings a small portion remaining of the thin, shellylining. The habit of the teredo, after it once gets inside the wood,is to bore with the grain. It never bores into its neighborsburrow, though it may bore exceedingly close to it; it nevercrosses another burrow in search of solid wood ; it never ITS PREPARATION AND USES 13 bores out to the surface again. The teredo is highly con-trac
Creosoted timer . than its actualsize, a picture of a fragment of wood split from a branchw^hich had been bored by small teredos, showing longitudi-nal sections of two borings, and showing in the upper of thetwo borings a small portion remaining of the thin, shellylining. The habit of the teredo, after it once gets inside the wood,is to bore with the grain. It never bores into its neighborsburrow, though it may bore exceedingly close to it; it nevercrosses another burrow in search of solid wood ; it never ITS PREPARATION AND USES 13 bores out to the surface again. The teredo is highly con-tractile. Sometimes when it has bored as far as it can goand retain its communication with the water by means ofits siphons, which is essential to its existence, it contractsto half its length and starts a boring at almost a right anglewith its previous boring, continuing in that direction untilit is far enough away to clear the previous boring, and thenstarting along the grain again in the same direction as Fragments of a Split Twig, showing Longitudinal Section of Teredos Burrows. In Northern waters the teredo attains a length of three orfour inches and more, sometimes ten inches ; there aresome species in these waters, however, that are smaller thanany here described. In tropical waters the teredo commonlyattains a length of ten inches, and there are teredos thatgrow to be six feet long. The teredo attacks wharves, boats, fish-net stakes, any
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Keywords: ., bo, bookcentury1900, bookdecade1900, bookpublishernp, bookyear1900
