The most that can be said to he capable of proof is the infiltration of some northern influence into Crete at the end of Minoan Period II.; but it probably brought about no change of dynasty and certainly no change in the prevailing race.
For warmth, for dryness, for absence of fog, and for facility of walking after rain, just when the air is at its purest and its best, there is nothing equal to gravel; but when gravel has been rendered foul by infiltration with organic matters it may easily become a very hotbed of disease.
The theory of the subsequent infiltration of the gold is that generally accepted.
Thus they are mainly responsible for the introduction of Islam with its Arabic or Persian civilization into India and Europe, and in earlier times their movements facilitated the infiltration of Graeco-Bactrian civilization into India, besides maintaining communication between China and the West.
From Manchuria, it was assumed, the political influence and spontaneous infiltration would naturally spread to Korea, and on the deeply indented coast of the Hermit Kingdom might be constructed new ports and arsenals more spacious and strategically more important than Port Arthur.
The recent investigations already referred to indicate the desirability of curving dams in plan in order to reduce the possibility of tension and infiltration of water at the upstream face.