452 Scientific Proceedings. Royal Dublin Society. 



8. Hymenoea eonrbaril. 



No. 166, from Botanic Gardens, Georgetown, Demerara, labelled " Locust 

 {Hymenoea eonrbaril, L.)." PL XXVI., figs. 25, 26, 27. 



Pink brown, lustrous, not roey ; vessels zoned, contents rare. Fibres 

 zoned, dense zones alternating with less dense. Parenchymatous laminae, 

 Oo mm.-3'0 mm. apart, avoiding vascular zones ; sometimes two laminae 

 between the vascular zones. Sp. gr. = 095. 



C.S. — Vessels circular, scattered or in small radial groups, M.T.D. = 

 0'30 mm. ; 5-7 groups in 2-mm. field ; contents granular, dirty. — Fibres 

 thick-walled, very thick in zones, often with contents. — Circumvasal paren- 

 chyma, 1-4 cells thick, spreading tangentially ; lamellar 3-4 cells thick, 

 both empty.— Eays empty. 



T.S. — Rays irregular in size, acute, sides irregularly bowed, 30-35 in 2-mm. 

 field ; total width in 2 mm. = 0-30 mm. Height = 0-65 mm. up to 0-96 mm. 

 Width = 0-056 mm. 1-, 2-, 3-, 4-, 5-, 6-ply. Margin inconspicuous, empty. 

 Middle cells thin-walled, empty. 



R.S. — Fibres non-septate, often with contents. 



Note. — The thick coating of circumvasal parenchyma of the vessels 

 excludes this wood from those properly called mahogany. 



9. Lysiloma sabicu. 



No. 282 from Royal Botanic Gardens, Kew, labelled " Sabicu, Lysiloma 

 sabicu, Cuba. Received from the Admiralty, 1855." PL XXVI., 

 figs. 28, 29, 30. 



Very dark brown, dull, vessels often distinctly zoned ; wood very hard, 

 distinctly roey. Irregular and undulating discontinuous parenchymatous 

 laminae connecting the adjacent vessels tangentially, and in vessel free 

 zones ; 0'25 mm.-0'5 mm. apart. Rays very fine. 



C.S. — Vessels tangentially compressed;" scattered or in radial groups of 

 two (" divided "), often with dark or translucent 'deposit. M.T.D. = 0'20 mm., 

 10-18 in 2-mm. 'field.— Fibres very thick-walled, sp'eck like lumen filled with 

 black deposit, 1-6 between rays. — Circumvasal parenchyma 1-5 cells thick', 

 filled with dark substance and conspicuous, spreading tangentially and 

 connecting adjacent vessels. Laminae 1-10 cells thick, usually filled with 

 dark deposit; scattered parenchyma occasional among fibres also filled. — 

 Eays with dark deposit. 



T.S. —Rays irregular in size and arrangement. About 200 in 2-mm. field. 



