on a FARMERS’ BULLETIN 159, 
Termites even pass over substances they can not penetrate, such 
as metal or stone, brick, or concrete foundations, by means of small 
shelter sheds or granular, earthlike tubes constructed of earth and 
excrement extended up from the ground. 
Any wood construction in contact with the ground is especially 
liable to attack by white ants. Among these may be listed construc- 
tion timber in bridges, wharves, and similar structures, telephone and 
Fic. 8.—Oak floor honeycombed by white ant Leucotermes flavipes. Washington, D. C., July, 
1915. Photograph by C. H. Popenoe. (Author’s illustration.) 
telegraph poles,' mine props, railroad ties, posts, lumber piled on the 
ground, wooden boxing for cables, cypress water tanks, ete. 
DAMAGE TO STORED MATERIAL. 
Of the stored material sometimes seriously injured or destroyed by 
termites may be mentioned wooden electrotype blocks and other wood 
products, books or papers in libraries or elsewhere (fig. 10), valuable 
documents (fig. 11), wood-pulp products, pasteboard, rolls of cloth 
and other fabrics, clothing, shoes and other leather products, as well 
as food stored on shelves or on the floors in dark, damp basements or 
cellars, or similar moist places where the ventilation is poor. 
1In California damage to poles by Termopsis angusticollis Walker (fig.9),and in the Gulf States by Calo- 
termes spp. also occurs. 
