THE JACK TREE 



Bark. ? 



Uses, etc. "Canoes and furniture in Ceylon . . . a large tree" 

 (37). A wood of good appearance but works badly being very 

 cross-grained. The soft parts which alternate with the metallic 

 green bands not only rip out but if required for finished work 

 absorb much polish and make the process tedious. 



Authorities. Gamble (37), p. 331. 



Colour. Greenish or greenish-brown heart-wood. Sap-wood ? 



Anatomical Characters. Transverse Section : — 



Pores. Conspicuous from their size, Grade 2, little variation : 

 uniformly distributed : few, 1-9 per sq. mm. : single, or sub- 

 divided into compact groups of 2-4 : pores radial or clustered : 

 appear white in the solid being sometimes filled with a white 

 deposit. 



Rays. Very distinct, size 5, uniform : nearly equidistant, the 

 width of a large pore apart : weak, scarcely avoiding tiie pores 

 but otherwise straight : numerous, 4-6 per mm. : denser and 

 much lighter in colour than the ground-tissue. 



Rings. Doubtful : no traceable boundary. Ground-tissue 

 uniformly spongy, the cells are arranged in radial lines. 



Soft-tissue. Conspicuous in patches partly imbedding and 

 connecting the pores, sometimes as wings to them : resembles 

 the spongy ground-tissue. 



Pith. ? 



Radial Section. Pores, prominent from their hoary borders 

 and sometimes from their white contents. Rays, very clear on 

 account of their white colour resembling that of the soft tissue. 

 Small shining flakes. Neither rings nor soft-tissue traceable. 



Tangential Section. As the Radial, but the rays are upon the 

 limit of vision, minute lines about 2 - o mm. high. 



Type specimens authenticated by the Forest Officer to the 

 Government of Ceylon ; from a plank sent to the Colonial and 

 Indian Exhibition. The sizes of the pores and of the rays given 

 above scarcely tally with Gamble's description. 



No. 180. THE JACK TREE. Artocarpus integri- 



folia. Linn. 



Plate XIII. Fig. 113. 



Natural Order. Urticaceas. 



Alternative Names. For those in the various dialects of India 

 see Gamble, p. 329. Jak-wood, Jaack-wood, Jaca-tree, etc. 

 Kuthul : Orange-wood (48). Kos in Ceylon (37). Nangka buhriet 

 (Timor) : Nangka (Malacca) : Nongko (Java). Tjoebadah kam- 

 pong (Malacca, Sumbawa), Rappo tjedo (N. Java) (123). Jac- 

 queira, Jaca, Brazil (76). 



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