8 The Timbers of British Guiana. 



the Kays of most woods, they contain colouring matter. The 

 small Rays are also pigmented and resemble the " edge-cells " 

 of the larger. Height of the larger about 1 m/m. 



Type Specimens. Authenticated by Bell, No. 7/2633. 



8. LTJCUMA MAMMOSA. GAEBTM. 



Nat. Ord. y SAPOTACE^:. 



Synonyms, ACHRAS MAMMOSA. LINN; A. LUCUMA. BLANCO. 

 not LUCUMA BONPLANDII, as reputed. 



Alternative Names.'' Barataballi " (2); " Bartaballi " (12); 

 "Mammee Sapote. Marmalade Plum" (16a); " Salie " (106); 

 " Marmelade naturelle. Leucome " (26); " Mamey Colorado. 

 Sapote" (12). 



Salient Features. A fine-grained, compact, rather hard, heavy 

 wood of a uniform reddish colour. 



Physical Characters. Weight (so far recorded), 56 J Ibs. per 

 cubic ft. Hardness, Grade 4, hard; compare Yew. Smell or 

 taste 0. 



Colour. <{ Pale brown" (12); " Red _ brown " (2). Appar- 

 ently a Sapwood tree. My specimen, 8 ins. in diameter, is all 

 Sapwood. Darkens slightly on exposure to the air. Surface 

 clean. 



Bark. About in. thick; hard and woody, brown within; 

 full of hard, whitish bodies. Surface of the log under the bark, 

 finely striated. 



Uses, Qualities, etc. " Plentiful averages a height of 90 ft. 

 boards doors, etc. furniture, partitions can be had to square 

 20 ins. free of Sap " (20). Saws rather easily. Fissile, takes 

 nails badly. Planes and turns moderately easily and well. 

 Polishes indifferently. A wood of good appearance and quality, 

 but scarcely of sufficient merit to compete with similar woods in 

 the European market. 



Authorities. 2. Bell, p. 3. 3. Berkhout (specimen). 4a. 

 Boulger, p. 426. 12. Hawtayne, pp. 384, 449. 16o. Kew, p. 

 137. 10. Devenish, p. 423. 20. McTurk, p. 4. 26. Schomburgk. 



ANATOMICAL CHARACTERS. 



The same as those of Sibbidanni (No. 78). 



Transverse Section. Darker than the other sections. 



Pores. Visible to the naked eye ; small ; not diminishing dur- 

 ing season's growth ; some variation, but in no particular order. 

 Scattered and evenly distributed, having the appearance of being 

 attached to the Rays. 



Rays. Visible to the naked eye; fine; of one kind; regular, 

 more than the width of a Pore apart; not avoiding the Pores. 



Rings. Apparently defined ; boundary doubtful ; contour 

 regular. 



Soft Tissue of no definite arrangement, sheathing the Pores 

 only. 



