What was the first type of early glue?
How far back do you want to go?
After all, the answer to your question is that substance that the first time
a humanoid discovered that something stuck two things together and that
could be just about anything.
The very first glues were made several hundred thousand years ago,
and made from sticky tree sap. Clearly, there has been a lot of
improvement since then! If you Google "early glues", you can find quite
a lot of interesting historical information.
"There is evidence of man using amber as glue as much as 11,000 years
ago. In ancient Egypt, man knew how to boil fish or animal skins to
make glue as well."
Click here to return to the Material Science Archives
Update: June 2012