Known that the Hevea tree usually furnishes very inferior rubber if tapped before it is six or seven years old, and there is evidence to show that the quality of the rubber improves with the age of the tree.
Ordericus Vitalis improves this legend by details of an interview with the devil, who prophesied Gerbert's threefold elevation in the famous line that Gerbert's contemporaries attributed to the pope himself: Transit in R.
Paring and burning improves the texture of clay lands, particularly if draining is carried out at the same time.
The statoblasts require a period of rest before germination, and Braem has shown that their property of floating at the surface may be beneficial to them by exposing them to the action of frost, which in some cases improves the germinating power.
Compelled by the windy climate the colonists are doing something to repair these ravages by planting European, Californian and Australian sheltertrees; but it is only in the naturally open and grassy regions of the east and south-east that settlement as yet improves the landscape.