470 Scientific Proceedings, Royal Dublin Society. 



f 



T.S. — Rays irregular in size and arrangement. About 53 in 2-mm. field. 

 Total width in 2 mm. = 0\56 mm. Height = 0"47 mm. (15 cells), width = 

 045 mm., 1-2-ply. Margin distinct, often of several tiers of cells, often 

 with concretion in cells. Inner cells narrow. Cells of margin and others 

 often filled. — Fibres 2-5 between rays. 



U.S.— Margin of square cells, fringe of palisade often with concretion, 

 inner cells radially elongate, often filled. — Fibres non-septate, 4-25 between 

 parenchymatous laminae. — Parenchymatous laminae 1 cell thick. Cells 

 usually with concretion, otherwise empty. 



32. Moabi. 

 No. 291, from commercial source, labelled "Moabi." PI. XXXVIL, 

 figs. 94, 95, 96. 



Eed-brown, with narrow, dense zones alternating with wider vascular 

 zones, each pair 2-4 mm. wide. Very fine parenchymatous laminae about 

 02 mm. apart. Wood roey and lustrous. Sp. gr. = - 76. 



C.S.— Vessels compressed tangentially, very close, single or in radial 

 groups of 2 or 3. M.T.D. = 0-19-inm. About 50 groups in 2-mm. field. With 

 tyloses. — Fibres forming tangential zones 2-10 thick, thick-walled, lumen 

 almost obliterated, 2-7 between rays. — Parenchymatous laminae irregular and 

 sinuous, 1-5 cells thick ; cells sometimes filled. No circumvasal parenchyma. 

 Pays conspicuous, filled, bent round vessels. 



T.S. — Pays irregular in size and arrangement ; about 65 in 2-mm. field. 

 Total width in 2 mm. = 0-64 mm. Height = 040 mm. 12-15 cells. Width = 

 0'045 mm. 1-, 2-, 3-ply. Margin distinct of 4 or 5 layers, 1 cell thick ; cells 

 square and often filled and with concretion. Inner cells small and rounded, 

 often filled. 



R.S. — Margin of rays of cells with thick pitted walls, the outermost 

 forming a fringe of somewhat rhomboidal palisade cells. — Parenchyma and 

 fibres conspicuous, latter non-septate. 



ASIATIC AND AUSTRALASIAN MAHOGANIES. 



33. Cedrela toona. 40. Shorea robusta. 



34. Cedrela australis. 41. "Engteak.". 



35. Cedrela serrate. 42. " Camphor wood." 



36. Dysoxylon lessertianum. 43. " Yang." 



37. Pterocarpus indicus. 44. Tarrietia javanica. 



38. "East Indian mahogany.'' 45. Acacia koa, 



39. " Red Serayah." 



