GUIDE TO TIMBERS OF NIGERIA 79 



Ground -tissue -cells visible with the rnacroseope on account 

 of their (apparently) crystalline contents ; rather more than 

 one-third of the mass. 



Rings apparently defined to the naked eye by variation in 

 colour, but no definite boundary can be determined with the 

 lens. 



Radial section. Grain, coarse, brown on account of the 

 colour of the linings of the vessels ; the pores come out in 

 zigzag patches. Parenchyma (a) obscure from lack of colour ; 

 P. (b) in fine vertical lines covering nearly one-quarter of the 

 surface, but the lines themselves are apparent only with the 

 macroscope. Rays visible by reflection as dull narrow 

 flakes. 



Tangential section. As the radial, but the rays are only just 

 visible with the lens, and then only when by decay they become 

 more prominent ; height up to twelve cells by one cell 

 wide. Vessels more regularly distributed than in the radial 

 section. 



Pith ? SAP WOOD. Not differentiated from the heart- 

 wood. 



BARK. Silvery- grey, scaling in small, longitudinal flakes and 

 exposing the brown subjacent layer. The scales are very 

 thin. Total thickness of bark (of sp. No. 3619) about J inch. 

 Inner substance brown, consisting of many exceedingly thin 

 layers which are visible with lens. 



Density, No. 3619, 0'66 or about 41 Ib. per cu. ft. 



" Oregbo Erin." Not identified. 



Leguminosse ? 



Specimen 3615 received from the Government of Nigeria 

 (Lagos). 



GENERAL CHARACTERS. A hard and heavy wood of a pleas- 

 ing nut-brown colour relieved by loops and zigzags of a paler 

 shade much resembling the old-fashioned Partridge wood 

 (Andira inermis). Surface clean. Hardly cold to the touch ; 

 dry. Grain, rather coarse, open and fairly straight. Trans- 

 verse section darker and hornier than the other sections. 

 Srnell, none. 



STRUCTURE. Resembles that of Pterocarpus (c.f. Fig. 2, 

 PL II). 



