376 Mr A. Galletly on certain 



its boiling point, it suddenly swells to many times its 

 volume, becoming transparent and of a fine claret colour. 

 This extract behaves in a somewhat similar manner with 

 olive oil. Of all the extracts examined, which include 

 those of greenheart and teak as well as the rosewoods, this 

 is the only one which has shown this peculiarity. 

 The alcoholic extract of mahogany is — 



1. Insoluble in benzole. 



2. Insoluble in bisulphide of carbon. 



3. Insoluble in turpentine, but when heated it suddenly 



swells to many times its original volume. 



4. Insoluble in warm olive oil, but swells. 



5. Soluble in hot acetic acid. 



6. Insoluble in chloroform. 



7. Eeadily soluble in acetone. 



[The ether extract of mahogany has nearly the same 

 characters.] 



It will be noticed that the sample of "Spanish" mahogany 

 used had twice the density of the Honduras specimen, 

 and that the extracts from the latter are much smaller in 

 amount than those obtained from the former. Honduras 

 mahogany is generally a much lighter wood than that 

 imported from Cuba. 



The wood of greenheart, Nectandra Bodwei, specific 

 gravity -991, treated in the same way as the above, gave — 



These extracts have the following solubilities : — 



Naphtha Extract. 



1. Soluble in bisulphide of carbon. 



2. Soluble in ether and alcohol. 



3. Insoluble in acetic acid. 



4. Soluble in acetone, but not readily. 



This is more a vegetable fat than a resin. It has not 

 the characteristic resinous odour even when fused, and its 

 alcoholic solution gives a precipitate with acetate of lead, 

 corresponding with fatty bodies generally. It does not 



