THE TIMBERS OF COMMERCE 



loose straggling lines : some single, mostly subdivided in compact 

 groups of 4-5 pores : few, 9-15 per mm. : glisten at times. 



Rays. Need lens, size 4-5, uniform : almost equidistant, 

 slightly less than the width of the large pores apart which they 

 lightly avoid, otherwise fairly straight : somewhat denser than 

 the ground-tissue : many, 7-9 per mm. 



Rings. Very regular bands of light and shade corresponding 

 with certain zones of pores when they form straggling lines, but 

 nothing of the nature of a boundary line. 



Soft-tissue. Very little : narrowly encircling the pores and a 

 few lines of single cells here and there. 



Pith. ? 



Radial Section. Much lighter in shade than the Transverse 

 section, a greenish tinge occasionally. Pores rather prominent, 

 coarse, colourless, cellular grooves containing drops of resin 

 which look like silver beads. Rays visible in certain light, very 

 inconspicuous flakes. Rings vague or rarely perceptible. 

 - Tangential Section. As the Radial but a little darker in shade. 

 Rays, minute lines on the limit of vision, about o - 5 mm. high. 



Type specimens authenticated by the Forest Officer to the 

 Government of British Guiana. 



No. 156. TIMBER SWEET-WOOD. Nectandra 



exaltata. Griseb. 



Plate XII. Fig. 100. 



Natural Order. Laurinese. 



Synonyms. In partim N. sanguinea. Griseb (not of Nees., 

 or Rottb.). 



Alternative Name. Boniato amarillo in Cuba (12). 



Source of Supply. West Indies, chiefly Jamaica. 



Physical Characters, etc. Recorded dry-weight 53 lbs. per 

 cu. ft. Hardness Grade 2, compare Boxwood. Smell none. Taste 

 bitter, unpleasant. Burns very well : no juice expelled by 

 heat : embers glow very brightly in still air. Solution faint 

 brown. 



Grain. Rather fine and open. Surface lustrous. 



Bark. ? 



Uses, etc. " Interior work " (12). A dense, solid wood re- 

 sembling Greenheart : liable to crack in the sun. 



Authorities. Wiesner (131), L. p. 75. Boulger (12). 



Colour. Brownish with a tinge of green. Cloudy, irregular 

 zones at times. 



Anatomical Characters. Transverse section : — 



Pores. Prominent from their lighter-coloured masses, size 

 2-3, nearly uniform : evenly distributed : single or subdivided 



178 



