On the bank of a stream which empties into the Mississippi ".

Perrot promised to comply with their wishes within twenty days.

Deposits of lead then existed on both sides of the Great River.

Opinion differs on the question whether Perrot built a post upon Catfish Creek in the Iowa country or upon the Galena River in Illinois.

One fact, however, seems certain in the absence of available records to the contrary : Perrot was the first European who mined lead in this region.