Note 71 — Chapter IV · THE POSSIBILITIES OF AGRICULTURE—(continued).
Reading edition
The researches of Tisserand may be summed up as follows:
Year. Population in millions. Acres under wheat. Average crop in bushels per acre. Wheat crop in bushels.
1789 27·0 9,884,000 9 87,980,000
1831-41 33·4 13,224,000 15 194,225,000
1882-88 38·2 17,198,000 18 311,619,000