Having now treated at sufficient length of the requisite conditions of the weather and the soil, we shall proceed to speak of those trees which are the result of the care and inventive skill of man. Indeed, the varieties of them are hardly less numerous than of those which are produced by Nature,[1] so abundantly have we testified our gratitude in return for her numerous bounties. For these trees, we find, are reared either from seed, or else by transplanting, by layers, by slips torn from the stock, by cuttings, by grafting, or by cutting into the trunk of the tree. But as to the story that the leaves of the palm are planted by the Babylonians, and so give birth[2] to a tree, I am really surprised that Trogus should have ever believed it. Some of the trees are reproduced by several of the methods above enumerated, others, again, by all of them.