FLINT IMPLEMENTS. 103 
obtained nearer than at the Cascades (previously 
described in vol. 1.), and must have been either 
traded from the Indians inhabiting that district, 
or brought from there by themselves. 
I am disposed to think a regular flint trade 
was carried on by these inland tribes, at some 
remote period. with the tribes living on the sea- 
board and lower parts of the Columbia. Not 
only were flints traded, but dentalia (tooth- 
shells), mother-o’pearl, and the barnacle parasitic 
on the back of the whale. I dug ornaments 
made from the three marine productions from out 
a gravel-bank, together with the centre skull in an 
Indian burial-ground (which it will be observed 
in the illustration* is unaltered by pressure 
during infancy), and a number of arrow-heads, 
fragments, and scrapers, made from flint, or 
other hard material, which must have been 
brought a very long distance, as it has no re- 
presentative in any rock found in the imme- 
diate neighbourhood. 
The place from whence I obtained these sin- 
gular relics was a gravel-bank, near Fort Colville, 
whilst digging out the nests of sand-martins.. 
From the way in which the various things were 
* Vol. II. 
