Extrapolate

Most of the words are faded, but it's still possible to extrapolate the meaning from these sentences.

“What we are able to do with the jawbone was compare it to closely related pterosaurs that are complete, and essentially just extrapolate from there,” Tim said.

With fresh material, taxonomic conclusions are leavened by recognition that the material examined reflects the site it occupied; a herbarium packet gives one only a small fraction of the data desirable for sound conclusions. Herbarium material does not, indeed, allow one to extrapolate safely: what you see is what you get[…]