In nature, the inclination and exposure of the ground, the degree of freedom or obstruction of the flow of water over the surface, the composition and density of the soil, the presence or absence of perforations by worms and small burrowing quadrupeds upon which the permeability of the ground by water and its power of absorbing and retaining or transmitting moisture depend its temperature, the dryness or saturation of the subsoil, vary at comparatively short distances; and though the precipitation upon very small geographical basins and the superficial flow from them may be estimated with an approach to precision, yet even here we have no present means of knowing how much of the water absorbed by the earth is restored to the atmosphere by evaporation, and how much carried off by infiltration or other modes of underground discharge.
The dunes near the mouth of the Nile, the lower sands of which have been cemented together by the infiltration of Nile water, would probably show a similar stratification in the sandstone which now forms their base. Dana describes a laminated rook often formed by the infiltration of water into the sand dunes on the Hawaian islands.
Soon after bunches of white hair appeared on the occiput, and in the succeeding years small patches of decolored hairs were observed also on the anterior and lateral portions of the scalp. In the spring of 1880 the patient exhibited signs of infiltration of the apex of the right lung, and afterward a violent headache came on.
From all that has been written three facts are prominent: That at some time early in the Middle Ages, perhaps about the seventh century, there was a considerable infiltration of Arabian culture into the tribes living below the Sahara, something of which may to-day most easily be seen among such people as the Haussas in the Soudan and the Mandingoes along the West Coast; That, whatever influences came in from the outside, there developed in Africa an independent culture which must not be underestimated; and That, perhaps vastly more than has been supposed, this African culture had to do with early exploration and colonization in America.
Although no perennial affluents enter the main stream lower down than Khartum, the volume of the Nile remains with little diminution throughout the entire distance to the Mediterranean. During the period of low water the amount of water in different localities is still uniform, notwithstanding all the irrigation, infiltration, and evaporation constantly taking place.
The effects on the joint vary in severity. In the milder forms, there is engorgement and infiltration of the synovial membrane, and an effusion into the cavity of the joint of serous fluid mixed with flakes of fibrin serous synovitis.
It consists of a thin bed of made earth, which, except in large towns, never reaches any degree of thickness; below this comes a very dense humus, permeated by slender veins of sand; and below this again at the level of infiltration comes a bed of mud, more or less soft, according to the season.
This is a very different operation from that of infiltration, which is commonly supposed to be the method of filling mineral veins; but, we shall soon see the reason why our author has here deserted the common hypothesis, and has adopted another to serve the occasion, without appearing to have considered how perfectly inconsistent those two suppositions are to each other.
The present infiltration of Jews has certainly produced some discontent, and it would be necessary to enlighten the Republic on the intrinsic difference of our new movement. Palestine is our ever-memorable historic home. The very name of Palestine would attract our people with a force of marvellous potency.
Why, such an infiltration of other hereditary characteristics, otherwise acquired, as might make the young painters of future generations more wide minded, more diversified, more individualistic, more vivid and lifelike.