To Pennsylvania belongs the honor of the deepest boring in America. A well on the land of R. A. Geary, about 5 miles northwest from the town of McDonald, near the line between Allegheny and Washington counties, has now attained a depth of 6,052 feet.2 This hole is being drilled by “The People’s Natural Gas Company,” a former subsidiary of the Standard Oil Company, of which Mr. John 6 . Pew, of Pittsburgh, is president and L. F. Barger general superintendent, and it is through their courtesy and that of Mr. J. B. Corrin, assistant superintendent of the Hope Natural Gas Company, that the writer was given access to the geologic data developed by the boring. Mr. Pew has chosen for the location of this deep well test the summit of the Condor dome, a structural feature in the rocks described in the Burgettstown-Carnegie Folio . . .