378 Mr A. Galletly o'/i certain Properties of Rosewood, &c. 



Alcoholic Extract. 



1. Insoluble in benzole. 



2. Insoluble in bisulphide of carbon. 



3. Insoluble in turpentine. 



4. Insoluble in hot olive oil. 



5. Slightly soluble in hot acetic acid. 



6. Slightly soluble in chloroform. 



7. Eeadily soluble in acetone. 



It is necessary to state that the specimen of teak 

 operated upon had a specific gravity considerably less than 

 vv'hat is usual with this wood. 



The naphtha extract of teak, which is proportionally 

 large, is a waxy substance, of a green colour, and very 

 sticky, even when long heated on the bath. It does not 

 become brittle when cold. At the temperature of boiling 

 water, or at least when very close upon it, it is a highly 

 viscid body, proving the absence of any fatty oils in the 

 wood. These oils, being all freely soluble in warm 

 naphtha, would have given this extract a greasy character 

 in place of its strong sticky nature. The absence of any 

 kind of a fatty oil in this wood is confirmed by the 

 insolubility of the extract in ether or alcohol. 



The solubilities of the ether and alcoholic extracts of 

 teak are remarkably different from those of the rosewoods 

 and of the mahogany, which have been given. A 

 comparison of the tables will show that they are almost 

 reversed. 



I am indebted to the following chemists for conducting 

 most of the above experiments : — Mr William Baxter, 

 formerly of the Bathgate Chemical "Works ; Mr David 

 Brown, of the firm of Messrs J. F. Macfarlan & Co., 

 Edinburgh ; and Mr John Galletly, Addiewell Chemical 

 Works, West Calder. 



