THE RESINOUS EXUDATION OF ROSEWOOD. 23T 
The second was sponged with methylated spirits, becoming 
a little lighter in colour, and the third was not treated in 
any way. The three pieces were left for two months, and, 
after (1) and (2) had been lightly rubbed down, on account 
of the grain having lifted under the preliminary treatment, 
were french-polished. After some months the two treated 
portions are still in good condition, whereas the untreated 
piece already shows signs of the polish being destroyed. 
Several pieces of Rosewood obtained from a log felled in 
April, 1922, were subjected to different conditions of heat 
and moisture in order to bring about the exudation, if 
possible. The moisture content of the wood when examined 
was 67°67 on the dry weight. One piece was placed for 
several hours in a temperature of 50° C. then exposed to. 
58° CO. for six days and finally heated to 100° C. for 4 hours, 
with no evidence of any exudation. A. similar piece of 
wood was exposed to an atmosphere saturated with water 
vapour at 58 C. for 24 hours then alternating moist and 
dry air at the same temperature for 7 days, but again no 
sign of sweating was observed. A fresh surface was then 
put on the timber, and it was exposed intermittently to a 
temperature of 58° C. for three months, but there was still 
no trace of “‘sweating,’’ although the Rosewood odour was 
still quite pronounced. A third piece was planed up and 
allowed to season at air temperature, but, after 44 months 
there is no external evidence of any oleo-resin, though a 
section showed that there was no lack of oil globules in the 
woody tissues. A piece of Rosewood from a log felled 
about 1910 showed very marked evidence of ‘“‘sweating,”’ 
there being numerous small oily patches on the surface. It 
was freshly planed up and exposed to a temperature of 58°C. 
intermittently for three months without any exudation 
appearing. On heating for several hours to 100° O., how- 
