Dixon — Mahogany, Recognition of some Different Kinds. 449 



3. Oedrela odorata. 

 No. 56 from commercial source, labelled " Havana cedar." 

 No. 191 from Havana cigar-box. PI. XXIII., figs. 10, 11, 12. 



Pink brown to greyish pink ; lustrous, not roey. Fibres and large vessels 

 distinctly zoned. Vessels often with dark contents. Parenchymatous 

 laminae, sometimes with continuous dark deposit, 2-15 mm. apart. Kays 

 pink or orange pink, contrasting with brown fibres. Sp. gr. = 0'45-0"50. 



C.S.— Vessels isolated or in small groups. M. T. D. = 045, 5-15 groups 

 in 2-mm. field, often with dark contents.— Fibres thin-walled, radially 

 compressed in tangential zones. — Circumvasal parenchyma 4-6 cells thick, 

 laminar parenchyma 2-6 cells thick, sometimes with intercellular spaces 

 filled with deposit ; scattered parenchyma abundant. 



T.S. — Pays fairly uniform in size, sides somewhat distorted and bowed, 

 40-50 in 2-mm. field. Margin acute, blunted or even bifurcated. Total width 

 of rays in 2 mm., 0-50-0-60 mm. Average height = 0-30-0-50 mm., 2-30 cells. 

 Average width = 0"04-0-06 mm. 1-, 2-, 3-, 4-, 5-ply. Margin of 1 or 2 cells, 

 acute or blunt, or even bifurcated, often with crystals. Middle cells often 

 bulging into fibres. — Parenchyma forming numerous short linear series of 

 about 8 cells, often containing crystals. 



R.S. — Fibres non-septate. — Pay margins of isodiametrical or horizontally 

 elongated cells. Crystals frequent. — Parenchyma conspicuous. 



4. Carapa guianensis. 



No. 160 from the Colonial and Indian Collections of the Imperial 

 Institute, London, labelled " British Guiana. B. G. Mahogany or Crabwood 

 (Carapa guianensis)." 



No. 162 from the Botanic Gardens, Georgetown, Demerara, labelled 

 " British Guiana mahogany, Carapa guianensis Aubl." PI. XXIV., figs. 13, 

 14, and 15. 



Pinkish brown, lustrous, and roey. Vessels distinctly or indistinctly 

 zoned. Occasionally a very porous zone occurs, often with black and 

 sometimes white contents. Fibres brown, rays orange pink. Parenchymatous 

 laminae fine, 0-3 mm.-25-O mm. apart. Sp. gr. = - 62-0"70. 



C.S.— Vessels isolated or in small groups. M. T. I). = 0'21 mm. 10-25 

 groups in 2-mm. field. "With black or light contents.— Fibres thick-walled, 

 sometimes radially compressed in narrow tangential zones. — Circumvasal 

 parenchyma 1 or 2 cells thick, often with dark contents. Laminar paren- 

 chyma 2-4 cells thick, empty, — Rays with dark contents. 



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