1888-89.] Wood of certain Resin-Producing Trees. 387 



Tulip wood (specific gravity, II 13) gave resinous extract — 



AVith naphtha, . . "600 per cent. 



With ether, . . . 2-200 



With alcohol, . . . 5-460 



Naphtha Resin. — The solution is colourless, but dries up 

 to a semi-liquid yellow resin, spreading over the dish as it 

 evaporates. It gives a greenish reaction with nitric acid. 

 With sulphuric acid it is at first greenish, but turns brown. 



Ether Resin. — In solution a fine ruby colour. The resin 

 is a fine reddish-brown when dry, and is brittle if well 

 dried. It is — 



1. Insoluble in bisulphide of carbon. 



2. Do. in turpentine. 



3. Do. m benzole. 



4. Do. in chloroform. 



5. Do. in olive oil. 



6. Soluble in acetone, with its ruby colour. 



7. Do, in glacial acetic acid, with brown colour. 



The alcohol resin has the same solubilities with similar 

 but more intense colours. It is brittle when fully dried. 

 The coloration with sulphuric acid is greenish-black, and 

 with nitric acid nearly black. 



Myall Wood — Spearwood. — Acacia homalophylla. — This 

 is an Australian tree of small size, growing on salt-bush plains 

 on the Murray Eiver and on barren scrubs from the Lachlan to 

 the Barren Eange. The heart-wood is dark l^rown, hard, and 

 with a smell resembling that of violets. It was used by the 

 aborigines for making spears, and the name spearwood is 

 sometimes given to it by the colonists, who consider it an 

 excellent wood for cabinetmaking. It is well known in this 

 country through its being used for tobacco pipes. 



Myall wood (specific gravity, 1-060) gave resinous 

 extract — 



With naphtha, . . '380 per cent. 



With ether, . . . .5-040 



With alcohol, . . , 7-380 



The naphtha resin in solution has a fine rich yellow 

 colour. The resin itself remains soft, and on drying loses 

 this colour, which does not re- appear on being again dis- 

 solved. It is only slightly soluble in cold alcohol, but 



