"The above results are obtained with the help of warm frames, thousands of glass bells, and so on. But even without such costly things, with only 36 yards of frames for seedlings, vegetables are grown in the open air to the value of £200 per acre. ...[I]n such cases the high selling prices of crops are not due to the high prices fetched by early vegetables in winter; they are entirely due to the high crops of the plainest ones."