10 . The Timbers of British Guiana. 



paired ; round , evenly distributed, imbedded in the soft tissue. 

 Few in number ; contents often sparkling. 



Rays. Visible with the lens; very fine; of one kind; uniform; 

 regular, about the width of a Pore apart; lighter in colour than 

 the ground tissue; avoiding the Pores. 



Rings. Ill-defined; boundary, an interruption in the succes- 

 sion of the bands of soft tissue, here and there ; contour regular. 



Soft Tissue of definite arrangement; type of Andira (27a. PI. 

 VI., fig. 52), Irriariadanni No. 42, and Dakama No. 20. Bold 

 and conspicuous light-coloured patches, sometimes lozenge-shaped 

 when isolated, or running together to form continuous lines which 

 broaden at the Pores and contract again between them. The 

 S.T. occupies about |rds of the whole of the wood. 



Radial Section lighter in shade than the Transverse. The 

 Pores are coarse, red, open, chambered grooves bordered by white, 

 soft tissue. The Rays are scarcely perceptible as small transparent- 

 looking flakes. The Rings are not indicated. 



Tangential Section as the Radial, but the S.T. appears in 

 bolder white streaks, and the Rays as very minute white lines,, 

 only visible with the lens, and are about '25 m/m. high. 



Type Specimen. Authenticated by Bell, No. 9/2665. 



10. CH^ETOCARPUS SP. 



.\'f/f. Ord., EUPHORBIACE.E. Native Name, " BOOBOORABALLI " (2). 



Salient Features. A tough, solid, fine, close-grained wood of 

 medium weight and hardness, with a satiny lustre and uniform 

 red-brown colour. 



Physical Characters. Weight (so far recorded), 52 J Ibs. per 

 cubic ft. Hardness, Grade 6, firm; compare Beech. Smell when 

 dry 0. Taste flat. Apparently a Sapwood tree. My specimen, 

 which is from a tree 11 ins. in diameter, is all Sapwood. Heart- 

 wood darkens a little upon exposure to the air. Surface lustrous. 



Bark. T VJ in. thick, scaling in long, thin, oblong flakes, 

 exposing the red inner layer. Inner surface ridged with spindle- 

 shaped ribs. Surface of log beneath bark grooved and glistening 

 with minute gum-drops. 



Uses, Qualities, etc. " Furniture easily procurable in logs 

 up to 50 ft. in length, squaring 12 ins." (2). Rather hard to 

 saw ; takes nails fairly well ; planes easily and well ; turns moderately 

 easily and finishes indifferently. A prettily-marked wood resem- 

 bling Maple, with which it might compete in the matter of 

 appearance. 



Authority. 2. Bell, p. 3. 



ANATOMICAL CHARACTERS. 



The same as those of Kakeralli No. 45, cf. Stone, Fig. 9, PL 7& 

 (27a), with the following differences: 



