Miracles of the Gods: A New Look at the Supernatural (368 page)

Pear trees and indeed plum trees belong to the family of Rosaceae. The pear tree is one of the deepest rooted species: it needs warm soil, into which the roots penetrate up to a depth of nine feet. The subsoil water should not rise above this height, as pear trees are sensitive to subsoil water. Plum tree flourish best on medium damp soil, but need a warm climate, like the related pear tree. An annual rainfall of about 600 mm is enough for both trees. In such conditions the fruit ripens with the steady passage of the seasons. It does especially well in a climate like that south-west of Milan.

This rhythm is sensibly disturbed if an unseasonable cold spell occurs, with unusually high rainfall and subsequent warm spells, like the Italian autumn, say. Owing to the cold shock, and the rain - both happened in the Milan region in September 1964! - the trees behave as if it were spring: owing to the cold and the damp soil the biochemical processes of metabolism begin and flower hormones are formed. If the trees are then subjected to autumn solar warmth again, we have the botanical and physiological 'miracle' of an autumn bloom on the tree simultaneously with fruit. The blossoms

'suddenly' stop and fall equally quickly; they bear no fruit because the bees have long since disappeared.

If the coupling of enzymes and hormones in the growth of plants is still a mystery. Mama Rosa's flowering pear and plum trees are certainly not a divine miracle, but a clearly explicable process, which the Bodensee fanner simply called 'magic bloom'.

Miracles fall to the ground from the tree of knowledge just as quickly as that!

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