304 Journal of the Asratic Society of Bengal. [August, 1912. 
He explains this change in the percentage composition as 
due to gradual oxidation of the resin contained in fresh teak- 
wood, which is soluble in chloroform, to a substance insoluble 
exposed to the air. The figures II represent the percentage 
composition of completely oxidized resin, and comparing them 
pared with figures I, until, in the case of the percentage com- 
position of alcoholic extracts from teak-wood that has been 
very long exposed to the air, the figures II will be obtained. 
From what has been said it seems clear that the amount 
of oxidation is a safe criterion of the amount of seasoning of 
mple. 
With this idea in view I set to work on the subject, but so 
far I have not been able to arrive at figures quite concordant 
with those obtained by Romanis (loc. cit.). The oxidized resin 
being insoluble in chloroform it was expected that this solvent 
would extract nothing from very old teak-wood. But contrary 
to expectation, the percentage of resin extracted from seasoned 
and unseasoned teak-wood by chloroform and alcohol were 
found as follows :— , 
Chloroform extracts. 
From fresh teak-wood From very old teak-wood 
(i.e. unseasoned wood)— (i.e. seasoned wood)— 
733% T'15% 
Alcohol extracts. 
From fresh teak-wood— From very old teak-wood— 
784% 700% 
