The Conquest of Bread by Peter Kropotkin

The market-gardeners, we say, are forced to become machines and to renounce all joys of life in order to obtain their marvellous crops. But these hard grinders have rendered a great service to humanity in teaching us that the soil can be "made. " They make it with old hotbeds of manure, which have already served to give the necessary warmth to young plants and to early fruit; and they make it in such great quantity that they are compelled to sell it in part, otherwise it would raise the level of their gardens by one inch every year. They do it so well (so Barral teaches us, in his Dictionary of Agriculture, in an article on market-gardeners) that in recent contracts, the market-gardener stipulates that he will carry away his soil with him when he leaves the bit of ground he is cultivating. Loam carried away on carts, with furniture and glass frames -- that is the answer of practical cultivators to the learned treatises of a Ricardo, who represented rent as a means of equalizing the natural advantages of the soil. "The soil is worth what the man is worth," that is the gardeners' motto.

And yet the market-gardeners of Paris and Rouen labour three times as hard to obtain the same results as their fellow-workers in Guernsey or in England. Applying industry to agriculture, these last make their climate in addition to their soil, by means of the greenhouse.