Review of previous Investigations.

The part of Pennsylvania described in this paper was allotted in the recent state survey to Professor Frederick Prime, junior, and in 1874 he made his first report (D), on page 62 of which the state geologist notes that Professor Prime “ has wisely said nothing in his report about his observations on supposed glacial drift.” He further notes that Mr Chance found, in the spring of 1875, a moraine behind the Lehigh Gap. In Professor Prime’s second report, DD, in 1878, he devotes chapter xxiv to “ The Glacial Epoch,” and states that his efforts to follow the lines of bowlders was “ a hopeless one and had to be abandoned.” He further notes the finding of vegetable remains in what must have been sub-glacial till, and characterizes the filling of a great range of limonite mines as “drift.” In his third report, D3, volume . . .

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