in Thoreau’s Journal:

Methinks the season culminated about the middle of this month––That the year was of indefinite promise before––   ––but that after the 1st intense heats we postponed the fulfillment of many of our hopes for this year––& having as it were attained the ridge of the summer––commenced to descend the long slope toward winter––the afternoon & down hill of the year––  Last evening it was much cooler––& I heard a decided fall sound of crickets––