42 The, Timbers of British Guiana. 



ANATOMICAL CHARACTERS. 



As Arisouroo, No. 3, which should be compared. Differences 

 -as follows: 



Pores. Visible with the naked eye, but scarcely conspicuous; 

 apparently diminishing towards the close of the season's growth; 

 considerable variation; often radially sub-divided. The oblique 

 lines of Pores are not often continuous for more than short lengths 

 (10-15 Pores), and these only in the dense wood; widely separated 

 elsewhere, yet clearly indicating oblique lines. 



Rays. Less than the width of a large Pore apart. 



Rings. Apparently defined; boundary doubtful; in any case 

 the narrow, dense zones, have nothing to do with the close of the 

 season's growth, as the continuous oblique lines of Pores cross 

 right over them. Contour regular. 



Type Specimens. Authenticated by Bell, No. 41/2697. 



42. NOT IDENTIFIED. 



Nat. Ord. y LEGUMINOS.E. 

 Alternative Names. " Irriariadanni " (2); " Irriariadan " 



Salient Features. A rather heavy, light brown wood, with 

 coarse, open grain, and of a red colour with conspicuous lines 

 of Soft Tissue. Sapwood dark. 



Physical Characters. Weight (so far recorded), 49 Ibs. per 

 -cubic ft. Hardness, Grade 4, hard; compare Hornbeam. Smell 0. 

 Taste little, if any. 



Colour of Heartwood, sharply defined from Sapwood; light 

 brown to dark brown; biscuit colour; with fine red lines (the 

 Pores) ; much lighter than the Sapwood, which is unusual ; darkens 

 *>ut little on exposure to the air, but the Pores bleed, thus becom- 

 ing prominent in vertical sections. Surface bright in Radial 

 section but dull in the others. Sapwood very dark grey, an 

 oinusual colour, possibly due to decay; width about If ins. 



Bark. About J in. thick, brown, lightly fissured. A thin, 

 brittle skin outside ; hard, woody, uniform in structure, but the 

 inner is grey, the outer light brown. Surface of log beneath 

 bark shows the oblique course of the grain, and has a matt 

 appearance where the Rays protrude from the surface (lens 

 required). 



Uses, Qualities, etc. " Readily procurable in logs up to 50 ft. 

 in length, squaring 12 ins. Most durable superior to Green- 

 heart produces a sticky, yellow gum " (20). Saws moderately 

 hard. Fissile, takes nails badly. Planes and turns moderately 

 liard and badly; polishes indifferently. Unless proved to be suit- 

 able for purposes for which Greenheart is used, this wood has 



