The Wealth of Nations by Part 1 Chapter 5 Page 15

current prices at the nearest public market. The money arising from this corn rent, though originally but a third of the whole, is in the present times, according to Dr. Blackstone, commonly near double of what arises from the other two-thirds. The old money rents of colleges must, according to this account, have sunk almost to a fourth part of their ancient value; or are worth little more than a fourth part of the corn which they were formerly worth.

But since the reign of Philip and Mary the denomination of the English coin has undergone little or no alteration, and the same number of pounds, shillings and pence have contained very nearly the same quantity of pure silver. This degradation, therefore, in the value of the money rents of colleges, has arisen altogether from the degradation in the value of silver.