Dixon— Mahogany, Recognition of some Different Kinds. 46? 



Brown and lustrous. Eoey. Parenchymatous laminae thin, indistinct, 

 finer than rays, irregularly spaced; 2 mm.-30 mm. or more apart. Vessels 

 aggregated in pore-zones,. with black deposit. Rays pink. . Sp. gr„ = 059. 



C.S — Vessels tangentially compressed, scattered, M.T.D. = 0'24 mm., about 

 10 groups in 2-mm. field, with occasional black contents.— -Fibres thick- 

 walled.— Circum vasal parenchyma, 2-4 cells thick spreading tangentially, 

 but not forming many laminae, sometimes with contents. — Rays with 

 contents. 



T.S. — Rays irregular, sides parallel or bowed, 30 in 2-mm field, total width 

 of rays in 2 mm. = - 44 mm. Height = - 60 mm. up to 1-0 mm. Width 

 0-070 mm. 1-, 2-, 3-, 4-, 5-ply. Margin sometimes indistinct, often with 

 contents. No crystals. Middle cells rounded, with contents. 



R.S. — Fibres non-septate. 



27. Cape Lopez Mahogany. " 



No. 154, from the Colonial and Indian Collections of the Imperial Insti- 

 tute, London, marked " French Congo. Cape Lopez mahogany." PL XXXVIL, 

 figs. 91, 92, 93. 



Warm brown ; slightly lustrous ; roey. Vessels distinctly zoned and 

 large, oval, subdivided; no deposit, but containing a cork-like substance 

 (tyloses). Rays pink. Parenchymatous laminae absent. Sp. gr. = - 51. 



C.S. —Vessels circular, scattered. M.T.D. = 0'50 mm. 2-6 groups in 

 2-mm. field, with tyloses. — Fibres thick-walled, sometimes radially compressed 

 in a zone. — Parenchyma scattered among fibres, and circumvasal, occasionally 

 with dark contents, sometimes compressed radially with fibres. —Rays with 

 dark contents, which are often drawn away from walls. 



T.S.— Rays irregular; sides undulating; 22-26 in 2-mm. field; total 

 width of rays in 2 mm. = 0-80 mm. Height = 0-90 up to 2-00 mm. Width = 

 040, up to 0-20 mm. 1-, 2-, 3-, 4-, 5-ply. Margin none; cells angular, 

 bulging, with contents drawn away from walls. 



U.S. — Fibres non-septate, in linear longitudinal series, regularly alter- 

 nating with parenchyma. 



28. Ptevocarpus sp. 



No. 215, from commercial source, labelled "African padouk." PI. XXXV., 

 figs. 82, 83, 84. 



No. 290, from commercial source, labelled "African padouk; Coral wood, 

 or Red wood." 



No. 145, from commercial source, labelled "Bullet wood," . , . . 



Crimson, not lustrous nor roey, with dark streaks ; hard, polishes on end 

 grain. Vessels indistinctly zoned. Narrow L . zones (about 1 mm. wide), 

 almost free from vessels. Parenchymatous laminae ; distinct, fairly evenly 



