474 Scientific Proceedings, Royal Dublin Society. 



R.S. — Laminar parenchyma 2-3-4 cells thick ; with end-walls horizontal. 

 — Bay-cells all similar. Wood parenchyma fibres with vertical series of 6-12 

 crystals frequent. 



Note. — This sample agrees with Moll and Janssonius' (loc. cit., vol. hi. 

 pp. 64 ff.) description of wood of Pterocarpus indicus: but the laminar 

 parenchyma seems less abundant : cf. 28. 



38. East Indian Mahogany. 



No. 211, from commercial source, labelled "East Indian Mahogany also 

 called ' Thitka.'" Pl.XLI, figs. 115, 116, 117. 



Pink-brown, lustrous and roey, with distinct growth-zones. Vessels small, 

 uniformly scattered ; fibres zoned. Parenchymatous laminae not visible on 

 cut surface. Pays straight, fine, storeyed. Sp. gr. = 076. 



C.S. — Vessels tangentially compressed, scattered, singly and in radial 

 groups of 2 or 3. M.T.D. = 0-20 mm. 30 groups in 2-mm. field. "With 

 tyloses. — Fibres thick-walled. — Circumvasal parenchyma, narrow and dis- 

 continuous ; scattered parenchyma often grouping into laminae of 1 cell 

 thick connecting adjacent rays, usually empty, separated by 1-4 fibres. 

 Occasional narrow zones, without parenchyma.— Pays narrow, often filled; 

 separated by 4-12 fibres. 



T.S. — Pays uniform, in oblique series; 70-80 in 2-mm. field; total width 

 in 2 mm. = 0-44 mm. Height = 012-0-30-0-70 mm.; 10-16 cells; width 

 0-01-0-04 mm. ; 2-, 3-, 4-ply. Margin 1 cell deep, usually empty. Inner 

 cells often filled. 



E.S. — Parenchyma of oblong rectangular cells, usually empty. Marginal 

 cells of rays square. 



Note. — Thitka (Pcntace burmanica, Kurz) has, according to Boulger (2), 

 moderately broad, wavy rays, and consequently can hardly be this wood. 

 Thitka is described by Foxworthy (7) as light and soft. 



39. Bed Serayah. 

 No. 229, from commercial source, labelled " Ped Serayah or Borneo cedar." 

 PI. XLL, figs. 118, 119, 120. 



Warm brown, indistinctly zoned in light and dark, slightly lustrous, not 

 roey. Parenchymatous laminae inconspicuous, - o-5 - mm. apart. Sp. gr. 

 = 0-44. 



C.S.— Vessels round, isolated or in small groups of 2-6; M.T.D. = 0-20 mm.; 

 7-9 groups in 2-mm. field, often with dark contents.— Fibres thick-walled, 

 zones with reduced lumina and thicker walls adjoining parenchymatous 



