444 



Scientific Proceedings, Jloijal Dublin Society. 



6. 



7. 



8. 



9. 

 10. 



11. 



12. 

 13. 



14. 



C.S. largely composed of thick-walled fibres with lumen almost 

 obliterated and of parenchyma in conspicuous groups or lines, 

 but not usually extending tangentially across more than 



4 rays, 4 



Fibrous elements of wood usually with open lumina ; parenchyma- 

 tous laminae where present extending across many rays, 8 



Some rays 6-, 7-, and 8-ply, 5 



Few or no rays more than 5-ply, 6 



Wood between rays formed of alternate layers of fibres and paren- 

 chyma of approximately equal thickness. 



41. "Eng. Teak." Diptero- 



carpus tuberculatus. 

 Fibrous layers of wood much thicker than parenchymatous. 



43. "Yang." 

 Over 40 groups of vessels in 2 mm. field C.S. and over 40 rays in 



2 mm. field T.S. 32. " Moabi." 



Less than 40 groups of vessels in 2 mm. field C.S. and less than 



40 rays in 2 mm. field T.S., 7 



Parenchymatous elements approximately equal to fibrous in C.S. 



40. Shorea rvbusta. 

 Fibrous elements greatly predominate in C.S. 



42. " Camphor wood." 

 Dryobalanops aromatica ? 



Circumvasal parenchyma conspicuous, often extended into narrow 



tangential laminae 9 



Circumvasal parenchyma inconspicuous, 12 



Vessels with tyloses. 30. Chlorophora excelsa. 



Vessels without tyloses, 10 



Hays often 4- and 5-ply. 8. Hymenoea courbaril. 



Pays 1- and 2-ply, 11 



Rays empty, uniform in height 5-8 37. Ptcrocarpus indicus. 



cells. 28. Fterocarpus sp. 



Pays filled, irregular in height 2-18 9. Lysiloma sabicu. 



cells. 



Vessels without tyloses, 13 



Vessels with tyloses, 35 



Some rays 3-, 4-, or 5-ply or more 14 



Rays 1- or 2-ply, 33 



Rays frequently 6- and 7-ply, 15 



Rays seldom or never 6- and 7-ply, 18 



