Dixon — Mahogany, Recognition of some Different Kinds. 451 



in vascular zone, 3 mm.-5 mm. apart, distinct. Sometimes with continuous 

 deposit. Sp. gr. = - 35-0'50. 



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

 0'32 mm. 4-12, groups in 2-mm. field. Contents black. — Fibres thin-walled, 

 radially compressed, often rectangular in vascular zones adjoining paren- 

 chymatous laminae, often with contents — Parenchyma cireumvasal 1 or 2 cells 

 thick, empty ; lamellar parenchyma adjoining band of compressed fibres in 

 vascular zone, 3 or 4 cells thick ; scattered parenchyma among the 

 fibres. — Eays often with granular contents. 



T.S. — Kays regular in size, acute with bowed sides, 35-40 in 2 mm. field ; 

 total width in 2 mm. = (KJO mm. Height = (Ki7 mm. up to 0"52 mm. 

 Width = O048. 1-, 2-, 3-, (4-) ply. Margin inconspicuous, empty, somewhat 

 bulging. Middle cells thin-walled, often with parietal contents. 



U.S. — Fibres non-septate ; tapered ends filled. — Scattered spindle-shaped 

 linear groups of wood parenchyma among fibres. 



7. Cariniana pyriformis. 



No. 146, from commercial source, marked "Mahogany" (PI. XXV., 

 figs. 22, 23, 24). 



Lustrous, roey. Grey-pink brown. Fibres zoned; vessels zoned, close 

 where fibres are less dense. Parenchymatous laminae very fine, close (about 

 O'lo mm. apart), wavy. Eays very fine. Sp. gr. = - 69. 



C.S. — Vessels, tangentially compressed, scattered, M.T.D. = 028 mm., 

 about 7 groups in 2-mm. field, often with tyloses. — Fibres thick-walled, very 

 regular, 2-16 between rays.— Cireumvasal parenchyma, with contents; 

 lamellar, also with contents, one or 2 cells thick, and 0'16-0'15 mm. apart. — 

 Eays filled. 



T.S. — Eays fairly uniform, sides bowed or parallel, very finely acute, 

 about 50 in 2-mm. field, total width of rays in 2 mm. = 0'20 mm. Height = 

 0-50 mm. up to 0"80 mm., 6-31 cells. Width = 0'04, 1-, 2-, 3-ply. Margin not 

 defined, acute. Middle cells rounded, thick-walled, with contents. — Fibres 

 sometimes divided into cubic crystalliferous cells. 



U.S. — Fibres non-septate. — Crystalliferous series in contact with paren- 

 chymatous lamellae. — Parenchymatous lamella very marked, composed of 

 vert, series of rectangular cells. 



Note. — This wood agrees closely with Sudworth and M ell's (18) descrip- 

 tion of " Colombian mahogany," Cariniana ■pyriformis Miers. 



