10 



Mahogany (Swietenia Mahogoni). Wood very hard, of rather 

 dull luster ; sap-wood narrow, yellow ; heart-wood deep reddish brown 

 darkening with age. 



Orange-wood (Citrus Aceantium). Wood hard, yellow through- 

 out, of a deeper shade in later summer-wood, somewhat lustrous; sap- 

 wood and heart-wood much alike in appearance. 



B. Pores comparatively small, scarcely visible to the naked eye on 

 longitudinal section {small-pored}. 



1. Pith rays in pa/rt Iroad and conspicuous, especially on radial 

 section (broad-rayed). 



Sycamore (Platanus) . Broad pith rays very numerous and crowded, 

 strikingly prominent on radial section though not conspicuous on tangen- 

 tial section. 



Beech. (Fagus) . Broad pith rays few in comparison with the narrow 

 ones, quite distinct though not especially conspicuous on radial section, 

 but appearing rather prominent as short reddish streaks on the tangential 

 section. 



2. Pith rays all narrow and inconspicuous, though sometimes distinct 

 on radial section {narrow-rayed). 



Olive-wood (Olea Bukopaea). Sap-wood whitish, cream color 

 or pale brownish; heart-wood olivaceous, yellowish or reddish brown, 

 strongly marked with wavy streaks of dark red or brown. 



Apple-wood (Ptkus Malus). Sap-wood more or less rosy ; heart- 

 wood reddish or brownish, streaked, if at all, with mostly straight lines. 



m. WITHOUT PORES, EXCEPT IMMEDIATELY AROUND 

 THE CENTRAL PITH (PORELESS). 



A. Resin ducts rather numerous and uniformly distributed, appearing 



somewhat prominently as reddish streaks on longitudinal sections 

 (many-ducted) . 



Hard Pine (Pinus, certain species). Wood medium hard and 

 heavy, summer-wood distinctly, often conspicuously, different in color 

 from the spring-wood. 



Soft Pine (PiNus, CERTAIN species) . Wood soft and light ; summer- 

 wood differing comparatively little from the spring-wood. 



B. Resin ducts comparatively few, rather irregularly distributed and 



not especially apparent on longitudinal sections (few-ducted) . 



Ijarch (Larix) . Heart-wood brownish orange ; sap-wood whitish ; 

 summer-wood strongly marked by deeper color. 



