75 The, Timbers of British Guiana. 



Radial Section. The Pores are inconspicuous though large ;. 

 obscured by the Soft Tissue which forms numerous, narrow, grey 

 borders to them. The Rays are prominent, though small, flakes. 



Tangential Section as the Radial, but the Rings are sometimes 

 traceable as cloudy lines or loops, and the borders to the Pores 

 are several times as broad as in the Radial Section. The Ray& 

 need the lens, being minute and about 1 m/m. high. 



Type Specimens. Authenticated by Bell, No. 74/2730. Imp. 

 Inst., No. 0099. 



This is the same wood as that described in 27a., p. 84. The 

 Pao roxo, mentioned by Allemao as Peltogyne Guarabu, is pro- 

 bably this wood. This systematic name may be a synonym of 

 P. paniculata, but it is not mentioned in the Index Kewensis. 



75. NOT IDENTIFIED. 



Native Name, " ROOKOOROOKOO " (2). 



Salient Features. A coarse-grained, light, soft wood ; white in 

 colour. 



Physical Characters. Weight (so far recorded), 31 Ibs. per 

 cubic ft. Hardness, Grade 8, very soft; compare Pine (American 

 White). Smell or taste 0. 



Colour of Heartwood uniform ; white to yellowish-white ; darkens 

 but little on exposure to the air ; surface lustrous ; not defined 

 from the Sapwood; (?) a Sapwood tree. 



Bark. J-J in. thick, brown, sloughing off in sheets; outer- 

 most sheet of specimen dark brown, with very small vertical 

 fissures; inner sheet smooth with very large (J in. diameter), 

 roundish lenticels ; hard ; woody. Surface of log beneath bark,, 

 smooth. 



Uses, Qualities, etc. " Inside boarding, or for splitting up into 

 matches. Is readily procurable in logs up to 30 ft. in length, 

 squaring up to 18 ins." (2). Saws very easily. Fissile, takes nails 

 badly; planes and turns easily but very badly; polishes indiffer- 

 ently. Export value nil. 



Authorities. 2. Bell, p. 9. 



ANATOMICAL CHARACTERS. 



Transverse Section. A trifle lighter in shade than the other 

 sections. 



Pores. Just visible with the unaided eye ; not diminishing 

 towards the close of the season's growth ; little variation ; evenly 

 distributed and widely scattered ; single or in groups of 2-4 Pores 

 radially disposed; few. 



Rays. Just visible with the unaided eye ; uniform ; regular ; 

 closely set, a little less than the width of a Pore apart; slightly 

 avoiding the Pores. They occupy half of the surface of this 

 section. 



