After a careful survey of the State, it was decided to conduct this
study in—(1), Chester Valley; (2), The Kutztown Valley, Berks County,
and (3), Center County. To date, there has been time only to make
observations in the first two localities. In the Chester Valley these
studies have been much facilitated because of the constant occurrence
of limestone toward the base of the mountains, and of shales toward
the top. Usually, more chestnut blight was found near the tops of the
mountains, and less, as one descends towards the valley.