Part V.] Sweet: On Air Seasoning of Indian Timbers. 29" 
Girdling reduced the surface cracking and splitting to the minimum 
and gave the best general results, although there was some slight 
damage by borers. 
Water seasoning resulted in the greatest amount of surface 
cracking and cupping and gave by far the poorest general results. 
Green conversion and seasoning in the log gave fairly good general 
results, although there was some borer attack in the sapwood in 
both cases. In spite of the fact that girdling gave the best general 
results green conversion is recommended for this species because of 
the liability to borer attack throughout the normally large sapwood 
if the logs are not promptly converted. Although this timber is 
inclined to crack and cup, if given proper protection and carefully 
piled, it can be seasoned with little depreciation. The logs should 
not be converted during the hot, dry season. 
(16) Chloroxylon Swietenia (Appendix I — ^16). South Chanda Division, 
Central Provinces. 
In both hoards and scantlings this wood showed a decided ten- 
dency toward surface cracking and toward cupping and twisting to 
a lesser degree. There was no evidence of insect attack either in 
the logs, girdled trees, or converted timber. When converted green 
and exposed to the atmosphere, this wood darkened somewhat on 
the surface. This darkening effect was even more noticeable and 
penetrated to a greater depth in the pieces seasoned by immersion in 
water. Seasoning in the log and girdling prevented the change in 
colour altogether. 
Girdling reduced the surface cracking more . than any other 
method and gave the best general results. The material seasoned 
in this way was badly cupped and twisted, but this was largely due 
to the fact that the pieces were savui from small logs. 
Seasoning in the log gave general results second to those of 
girdling although there was considerably more surface cracking and 
splitting. For some purposes the darkening of the wood as it occur- 
red in green conversion and water seasoning is not a defect, but for 
most of the uses to which this w'ood is put, discoloration must be 
avoided. 
It is very essential to give this wood ample protection from too 
rapid drying immediately after conversion, and also to stack the 
pieces with care to avoid cupping and twisting. The logs should be 
converted during the rainy season. 
(17) Oleistanthus collinus (Appendix I — 17). South Chanda Division, 
Central Provinces. 
Boards and scantlings seasoned with considerable surface crack- 
ing, cupping, and twisting. The species is to he classed with’ the 
most refractory woods. The material under test was cut from small 
C 175 ] 
