12 Indian Forest Records. [Vol. VII. 
The conclusions arrived at from the compression tests , carried out 
parallel to the grain , are as follows :— 
(1) There is no difference in the strength of the timber seasoned 
in the log in the open and under shade though, as in the case 
of tests for transverse strain, the timber from logs immersed 
in water (serial No. 11) has been adversely affected and 
shows a falling off in strength. 
(2) Trees were felled in September, December and June, which 
months correspond respectively with the end of the growing 
period, the period of rest when the sap is down and the 
commencement of the growing period. The results obtained 
are strictly comparative, as the trees were felled in the same 
locahties at each period of the year and the timber was 
seasoned in correspondingly different ways, while the results 
are based on 138 tests, on timber containing in every instance 
less than 13-43 per cent, of moisture. The timber felled in 
September showed a strength of 3-53 tons per square inch, 
that felled in December showed a strength of 4-41 tons per 
square inch and that felle 1 in June gave 4-09 tons per square 
inch. The timber therefore, which was felled when the sap 
was down was considerably the strongest, and this fact is 
corroborated by the tests for transverse strain. 
(3) The results show no difference between plains and hill-grown 
Sal from the Central Provinces, but a considerable difference 
in that from the United Provinces, the hill-grown Sal being 
as much as 0-34 tons per square inch stronger than the former. 
The United Provinces Sal on an average is slightly stronger 
than that from the Central Provinces. 
(4) From the above records an average of 4 tons per square inch 
may be taken as the compression strength of Sal timber. 
[ 131 ] 
