472 Scientific Proceedings, Royal Dublin Society. 



T.S. — Rays irregular, sides bowed, 35-40 in 2-mm. field. Total width in 

 2 mm. = 0-34 mm. Height = 0-43 mm., 5-15-21 cells. Width = 0-056 mm., 

 1-, 2-, 3-, 4-, 5-ply. Margin, usually bulging and triangular, often indistinct, 

 empty, often blunt and distorted. Middle cells thin-walled, bulging, usually 

 empty. 



R.S. — Margin truncated triangles, distinct. Fibres non-septate. 



Note. — According to the Index Kewensis (6) O. australis F. v. M. is a 

 synonym of 0. toona Roxb. 



Moll and Janssonius (11) describe the wood of Cedrela febrifuga, which, 

 according to Index Kewensis, is a synonym of C. toona Eoxb., and 

 consequently a synonym of above. The wood investigated by these authors 

 had rays 2-, 3-, and 4-ply, about 15 cells high. So far as the two 

 specimens (Nos. 239 and 196) here described are concerned, the chief 

 difference seems to be that No. 239 has fibres with considerably thicker 

 walls than those of No. 196. 



35. Cedrela serrata. 



No. 240, from Royal Botanic Gardens, Kew, labelled " Cedrela serrata 

 Royle, Satan, (Jhamba, 5000 feet. Section cut from India Forest Depart- 

 ment, marked H 782. (See 'A Manual of Indian Timbers,' Gamble, 1902, 

 p. 160.)" PI. XXXIX., figs. 106, 107, 108, 



Rose-brown, lustrous and roey, with light sap-wood, about 12 mm. thick. 

 Vessels zoned ; zones of large vessels separated by somewhat wider zones 

 composed of dense tissue, with a few small vessels scattered in it. Longitudinal 

 surfaces distinctly roey. Vessels and rays distinct. 



C.S.— Vessels rounded, isolated, or in radial groups of 2 or 3 large vessels, 

 occurring in narrow zones containing 2-4 ; smaller vessels scattered among 

 fibres. M.T.D. = 0'32 mm. ; 17-24 in 2-mm. field. Some vessels with dark 

 contents. — Fibres thin-walled on inside, moderately thick- walled on outside of 

 growth-zone ; 3-24 between rays. — Circumvasal parenchyma narrow, laminae 

 occasional on outside of growth-zone, about 10 cells thick, sometimes with 

 schizogenous spaces filled with dark deposit. — Pays distinct. 



T.S. — Pays irregular in size and arrangement, sides almost parallel, 

 finely tapered, about 55 in 2-mm. field. Total width in 2 mm. = 0-22 mm. 

 Height = 007- 0-30-0-45 mm. 2-18 cells. Width =0-01-0-04 mm., 1-2-3-ply. 

 Margin of ten distinct, pointed or blunt. Outline of middle cells rounded 

 and somewhat bulging into fibres. 



R.S. —Pay cells short and rounded, marginal ones square, angles filled 

 with deposit.— Circumvasal parenchyma rectangular, angles filled with deposit; 



