By the thirteenth century chestnuts had become an established article of human food in Italy. Pietro Crescenzi (1230-1307) describes two varieties, the cultivated and the wild, and quotes the Arabian physician Avicenna to the effect that chestnuts are "di tarda digestione ma di buono nuttimento." It is perhaps for this very reason that chestnut bread is acceptable to those engaged in heavy labor. Fynes Moryson says in his Itinerary (1617) that maslin bread made of a mixture of rye and wheat flour was used by labourers in England because it "abode longer in the stomach and was not so soon digested with their labour."
Crescenzi, who was a lawyer and a judge, says in his preface that he had left his native Bologna because of the civil strifes, had taken foreign service in several parts of Italy, and so had opportunity to see the world. He wrote his book on agriculture because, as he says, of all the things he learned on his travels there was nothing "piu a bondevole, niuna piu dolce, et niuna piu degna de l'huomo libero," a sentiment which Socrates had expressed sixteen hundred years earlier and which was echoed six hundred years later by another far-sighted Italian, the statesman Cavour.]
[Footnote 62: The white chalk which Scrofa saw used as manure in Transalpine Gaul, when he was serving in the army under Julius Caesar, was undoubtedly marl, the use of which in that region as in Britain was subsequently noted by Pliny (H.N. XVII, 4).
There were no deposits of marl in Italy, and so the Romans knew nothing of its use, from experience, but Pliny's treatment of the subject shows a sound source of information. In England, where several kinds of marl are found in quantities, its use was probably never discontinued after the Roman times. Walter of Henley discusses its use in the thirteenth century, and Sir Anthony Fitzherbert continues the discussion in the sixteenth century. In connection with the history of the use of marl in agriculture may be cited the tender tribute which Arthur Young recorded on the tombstone of his wife in Bradfield Church. The lady's chief virtue appears to have been, in the memory of her husband, that she was "the great-grand-daughter of John Allen, esq. of Lyng House in the County of Norfolk, the first person according to the Comte de Boulainvilliers, who there used marl."
The Romans did not have the fight against sour land which is the heritage of the modern farmer after years of continuous application to his land of phosphoric and sulphuric acid in the form of mineral fertilizers. What sour land the Romans had they corrected with humus making barnyard manure, or the rich compost which Cato and Columella recommend. They had, however, a test for sourness of land which is still practised even where the convenient litmus paper is available. Virgil (Georgic II, 241) gives the formula: "Fill a basket with soil, and strain fresh water through it. The taste of water strained through sour soil will twist awry the taster's face.">[
[Footnote 63: This sounds like the boast of the modern proprietor of an old blue grass sod in Northern Virginia or Kentucky. On the general question of pasture vs. arable land, cf. Hartlib's Legacie: "It is a misfortune that pasture lands are not more improved. England abounds in pasturage more than any other country, and is, therefore, richer. In France, acre for acre, the land is not comparable to ours: and, therefore, Fortescue, chancellor to Henry VI, observes that we get more in England by standing still (alluding to our meadows) than the French do by working (that is, cultivating their vineyards and corn lands)."
We may permit Montesquieu (Esprit des Lois II, 23, 14) to voice the French side of this question. "Les pais de pâturage sont pen peuplês. Les terres à bled occupent plus d'hommes et les vignobles infiniment d'avantage. En Angleterre on s'est souvent plaint que l'augmentation des pâturage diminuoit les habitans."
In the introduction to his Book Two (post, p. 179) Varro states the sound conclusion, that the two kinds of husbandry should be combined on the same land. Sir Anthony Fitzherbert knew this: "An housbande can not well thryue by his corne without he haue other cattell, nor by his cattell without corne. For els he shall be a byer, a borrower or a beggar.">[
[Footnote 64: This is the explanation of why Aesop's fox found the grapes to be sour which grew on a trellis, for he had expected to find them of easy access on the ground. Aesop was a Phrygian, and, while Bentley has proved that Aesop never wrote the existing fables which go by that name, yet it is recognized that they are of Oriental origin and it is evident that that of the Fox and the Grapes came out of Asia, where, as Varro says, the grapes were usually allowed to grow on the ground.]
[Footnote 65: One is tempted to include here Pliny's observations upon the tests of good soil if only for the sake of his description of one of the sweetest sensations of the farmer every where, the aroma of new ploughed fertile land:—