306 Journal of the Asiatic Society of Bengal. [August, 1912. 
a vacuum dessicator. °2281 ar ny ‘5798 ae of CO, and 
‘1480 gram of H,O. Found C=69°33%, H=7:21%. 
III. The dry resin which had been lying in an ordinary 
dessicator for about a week was taken. ‘2849 gram gave 
‘7120 gram of CO, and -1920 gram of HO. Found C=68-00%, 
She 
IV. The dry resin was heated in the steam oven for 30 
minutes in order to ensure complete drying, before being com- 
busted. (It was found that the resin which had attained a 
constant weight lost a further portion of A weight when left 
in the steam oven for some hours, but the loss was most 
marked during the first 30 minutes. “4181 eae lost -0163 
gram in 30 minutes when kept in the steam oven, but only 
0099 gram in the next two hours under the same conditions). 
2133 gram gave ‘5310 grant of CO, and -1306 gram of H,0. 
Found C = 67°89%, H=6'81%. 
Vi. The dry resin which had been lying in the 
steam oven for about six weeks was taken. (It was found 
that after some time the soft resin would no more melt in bean 
steam oven at 100° and was a brittle, rather shining m 
Evidently a part of the resinous substance Solan cs 
changed its composition). In the first case °1772 ore gave 
-4450 gram of CO, and -0996 gram of H.O. Found C=69 -60%. 
H=642%. In the second case ‘1730 gram gave ver gram 
of CO, and "1024 gram H,O. Found C=69:01%. H=655%. 
Combustions VII, VIII, IX and X were done exactly 
in the same way and under ‘the same conditions . combus- 
tions I, Ii, III and IV cast em A In the first case *1868 
gram gave *4790 gram of CO, and +1265 gram of H., 0. Found 
C=69:95%, H=7°52%. 
In the second case -2404 Green gave -6138 gram of CO, and 
1540 gram of H,O. Found C=69:75%, H=7-13%. In the 
third case "1425 gram gave ‘3730 gram of CO, and -0966 gram 
of H,O. Found C=70°39%, H=7°53° In the last case 
‘2478 gram gave Made gram CO, and 1540 gram H,O. Found 
C=69°47%, H=6°90 
Thus the pxoctace compositions of old and new teak- 
wood extracts were found to be practically the same. There- 
fore further hopes to work out any method based on the per- 
centage composition of the extracts were abandoned. 
Method based on the isolation of a crystalline substance from 
seasoned teak-wood. 
It was however found that the old teak-wood extract, when 
kept exposed to the air for about a month, separated white, 
feathery, long, prismatic oxyatols on its surface, while the new 
teak-wood extract did not even show the slightest tendency 
to separate any such crystals. Romanis (loc. cit). had no- 
