Why, when, and who of filling the weave on canvas?

Treewater

Wooden Canoes are in the Blood
I am seeking to find out how the use of fillers came about. Obviously, birchbark canoes had no filler so it was a recent invention. Who first did it? When did it come into general use? What was the purpose, or the assumed purpose at the time?
Anyone know?
 
Oops, did not see the reply from Dan Miller on the other thread. Still, the who and when remains.
 
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