80 The Timbers of British Guiana. 



Radial Section. The Pores have numerous clear or ruby beads 

 that glisten. 



Type Specimens. Authenticated by Bell, No. 78/2664. 



A tree is mentioned in " The Guide to British Guiana " (20a)> 

 as a species of Hevea, under the names of Sibbi-Sibbi or Hatti. 



79. NOT IDENTIFIED. 



Alternative Names. " Sikkisikki-danni " (2); " Siki-siki- 

 danna" (12); " Ironwood" (17). 



Salient Features. A hard, heavy, dull brown wood, showing- 

 much white deposit in the Pores. 



Physical Characters. Weight (so far recorded), 72 Ibs. per 

 cubic ft. Hardness, Grade 2, extremely hard; compare Boxwood. 

 Taste or smell 0. 



Colour of Heartwood as above. " Grey " (2) ; not denned from 

 the Sapwood. (?) a Sapwood tree. Darkens little if at all on 

 exposure to the air ; surface clean to bright. 



Bark. ( ?) Surface of log under Bark, grooved or ribbed. 



Uses, Qualities, etc. " Trees short and small. Used for piles 

 and house-framing" (2). Very hard to saw. Fissile, takes nails 

 badly; planes moderately easily but very badly; turns hard but 

 indifferently; polishes indifferently. Of doubtful value for export. 

 Sometimes confused with Sibbi-danni, No. 78, on account of the 

 similarity in the names. 



Authorities. 2. Bell, p. 9. 12. Hawtayne, p. 387. 17. 

 Laslett, p. 453. 



ANATOMICAL CHARACTERS. 



Transverse Section: 



Pores. Visible with the naked eye, conspicuous on account of 

 their white contents; little variation; oval; unevenly distributed; 

 all single and all filled with white matter. 



Rays. Just visible with the lens; uniform; somewhat irregular; 

 much less than the width of a Pore apart, very close and numerous ; 

 scarcely avoiding the Pores; golden. 



Rings. Apparently defined ; boundary (?) a Pore-less zone ; 

 contour nearly regular. 



Soft Tissue of definite arrangement; type of Pterocarpus (see 

 Bania, No. 6, and Wamara, No. 92, many' close, fine, undulating, 

 irregular, concentric lines, of similar colour to, but thicker than, 

 the Rays. 



Radial Section. The Pores are fine, milk-white lines. The 

 Rays are almost imperceptible. The Rings are not indicated. 



Tangential Section similar in appearance to the Radial (to the 

 naked eye). 



Type Specimens. Authenticated by Bell, No. 79/2735. 





