as, 5 Valencia: Commercial Philippine Timbers 489 
GUI JO 
Guijo [ Shorea guiso (Blanco) Blume] is a very widely dis- 
tributed and fairly abundant species. Foxworthy 4 estimates 
that it makes up about 5 per cent of the volume of the forests. 
This figure includes probably the product of one or more unde- 
termined species of Shorea, but undoubtedly the greater bulk of 
it is from the species named above. Botanical collections of 
guijo are reported from the following provinces and islands: 
Cagayan, Isabela, Bontoc, Ilocos Norte, Ilocos Sur, Abra, Union, 
Nueva Vizcaya, Nueva Ecija, Pangasinan, Tarlac, Zambales, 
Bataan, Pampanga, Bulacan, Rizal, Laguna, Batangas, Tayabas, 
Camarines, Albay, Sorsogon, Marinduque, Ticao, Mindoro, Mas- 
bate, Samar, Leyte, Negros, Capiz, Agusan, Misamis, Davao, 
Cotabato, Zamboanga. 
Guijo is a tall, straight tree ranging up to 1.80 meters or more 
in diameter and up to about 30 meters in clear length. The 
average diameter of merchantable trees will probably run from 
60 to 90 centimeters. 
Guijo is moderately heavy to heavy, moderately hard to hard, 
tough, and difficult to split; the sap wood is thin (2 to 5 centi- 
meters) , light grayish brown, not sharply distinguished from the 
heartwood; the heartwood is light ashy brown to brown, some- 
times with a distinct reddish tint; grain distinctly crossed; 
texture rather fine, taking a glossier surface, both in longitudi- 
nal and in cross sections, than apitong ; has a faint odor of resin ; 
seasons slowly and is liable to split and warp if not seasoned 
very carefully; not hard to saw, but on account of the crossed 
grain rather difficult to shape and surface. Not durable when 
in contact with ground or severely exposed to weather, but good 
under cover, being rarely attacked by insects, except termites. 
Structure . — Pith rays fine, not conspicuous ; pores rather 
small, scattered; soft tissue less abundant than in apitong, in 
thin, irregular rings about pores and in short, indistinct, tan- 
gential lines ; resin rings frequent, narrow, distinct ; growth rings 
sometimes faintly indicated in young trees; all the elements* in 
guijo are smaller and more sharply defined than in apitong, so 
that the cross section has generally a cleaner look, so to speak, 
than in the latter. 
Guijo is used for all kinds of general construction work where 
it is not severely exposed or where extreme durability is not 
absolutely required. It is preferred to apitong for practically 
4 Philip. Journ, Sci. § C 13 (1918) 165. 
