III. "And so," said Agrasius, "as we have agreed upon and eliminated from the discussion all those things which agriculture is not, it remains to discuss what it is. Is it an art, and, if so, what are its principles and its purposes?"
Stolo turned to Scrofa and said: "You are our senior in age, in reputation and in experience, you should speak." And Scrofa, nothing loath, began as follows:
"In the first place, agriculture is not only an art but an art which is as useful as it is important. It is furthermore a science, which teaches how every kind of land should be planted and cultivated, and how to know what kind of land will produce the largest crops for the longest time.[57]"
The purposes of agriculture are profit and pleasure
IV. The elements with which this science deals are the same as those which Ennius says are the elements of the universe—water, earth, air and fire. Before sowing your seed it behooves you to study these elements because they are the origin of all growing things. So prepared, the farmer should direct his efforts to two ends: profit and pleasure,[58] one solid the other agreeable: but he should give the preference to the pursuit of profit.[59] And yet those who have regard for appearances in their farming, as for instance by planting their orchards and olive yards in orderly array, often add not only to the productiveness of the farm but as well to its saleability, and so doubly increase the value of their estate. For of two things of equal usefulness, who would not prefer to buy the better looking?
The farm which is healthiest is the most valuable, for there the profit is certain. On the other hand, on an unhealthy farm, however fertile it may be, misfortune dogs the steps of the farmer. For where the struggle is against Death, there not only is the profit uncertain, but one's very existence is constantly at risk: and so agriculture becomes a gamble in which the farmer hazards both his life and his fortune. And yet this risk can be diminished by forethought, for, when health depends upon climate, we can do much to control nature and by diligence improve evil conditions. If the farm is unhealthy by reason of the plight of the land itself, or of the water supply, or is exposed to the miasma which breeds in some localities, or if the farm is too hot on account of the climate, or is exposed to mischievous winds, these discomforts can be mitigated by one who knows what to do and is willing to spend some money. What is of the greatest importance in this respect is the situation of the farm buildings, their plan and convenience, and what is the aspect of their doors and gates and windows. During the great plague, Hippocrates the physician saved not merely one farm but many cities because he knew this. But why should I summon him as a witness: for when the army and the fleet lay at Corcyra[60] and all the houses were crowded with the sick and dying, did not our Varro here contrive to open new windows to the healthy North wind and close those which gave entrance to the infected breezes of the South, to change doors and to do other such things, and so succeed in restoring his comrades safe and sound to their native land?
The fourfold division of the study of agriculture
V. I have rehearsed the elements and the purposes of agriculture, it now remains to consider in how many divisions this science is to be studied."
"I have supposed these to be without number," said Agrius, "when I have read the many books which Theophrastus wrote on The History of Plants and The Causes of Vegetation.
"These books," said Stolo, "have always seemed to me to be fitter for use in the schools of the philosophers than in the hands of a practical farmer. I do not mean to say that they do not contain many things which are both useful and practical. However that may be, do you rather explain to us the divisions in which agriculture should be studied."