64 The Timbers of British Guiana. 



Colour of Heartwood " as Greenheart " (2). Light brown; dull 

 brown ; darkens but little upon exposure to the air ; sharply defined 

 from the Sapwood. Sapwood the colour of oatmeal; width about 

 2J ins. 



Bark. About -fa in. thick, smooth, skinny and brittle; on the 

 inner surface are the impressions of the ends of the Rays (lens). 

 Surface of log beneath Bark, smooth or striated. 



Uses, Qualities, etc. "A furniture wood. Is readily pro- 

 curable in logs of 20-25 ft., squaring 8-12 ins." (2). Saws easily. 

 Fissile, takes nails badly; turns and polishes indifferently. The 

 tests are hardly fair, as the specimen was unsound. The wood has 

 a certain amount of lustre, but otherwise there is not much to 

 recommend it. Sometimes confused with Manni-balli, No. 62, on 

 account of the similarity of the names. 



Authority. 2. Bell, p. 8. 



ANATOMICAL CHARACTERS similar to Caraba-balli, No. 16. 



Transverse Section. Similar in shade to the other sections. 



Pores. Readily visible with the naked eye, conspicuous as 

 holes; not diminishing but rather enlarging towards the close of 

 the season's growth, sometimes the largest Pores are in the middle 

 of the Ring. They increase greatly as the tree ages. In my 

 specimen the Pores of the fifth Ring are twice as big as those of the 

 first. Evenly distributed; few and widely spread. 



Rays. Visible with the naked eye to good sight (after moisten- 

 ing) ; fine, uniform, regular, about the width of a Pore apart, or less, 

 scarcely avoiding the Pores. 



Rings. Boldly defined; boundary a zone of dense wood con- 

 trasted with the following laxer wood ; contour regular ; number 

 per inch of radius averages 1'44. 



Soft Tissue. Of definite arrangement; type of Fustic (Stone 

 27a, PI. XIII., and fig. 3), i.e., in concentric festoons uniting the 

 Pores. 



Pith.( ?) 



Radial Section. Similar in shade to the other sections or 

 nearly so. The Pores are rather coarse, open grooves bordered by 

 hoary soft tissue; quite inconspicuous in some cuts. The Rays are 

 extremely minute, just visible flakes. They give the section a 

 shaded appearance. The Rings are scarcely indicated, a slight 

 contrast here and there. 



Tangential Section as the Radial, but the Soft Tissue is much 

 more prominent, and the Rays need the lens, being microscopic 

 and about '1 m/m. high. 



Type Specimens. Authenticated by Bell, No. 63/2719. 



64. NOT IDENTIFIED. 

 Native Nome, " MARCIBALLI " (2). 



Not the " Mareiballi " described by Martin-Lavigne (20e), 

 p. 147. 



