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But decomposing in the presence of water, as in a bog, where the oxygen of the air is excluded, the carbonaceous matter of plants accumulates in deposits of peat. Peat bogs are numerous in regions lately abandoned by glacier ice, where river systems are so immature that the initial depressions left in the sheet of drift spread over the country have not yet been drained.
Between the hills lie high level-looking plains full of intolerable sun glare, or narrow valleys drowned in a blue haze. The hill surface is streaked with ash drift and black, unweathered lava flows. After rains water accumulates in the hollows of small closed valleys, and, evaporating, leaves hard dry levels of pure desertness that get the local name of dry lakes.
Lichen and moss grow on the mortar wherever it has become slightly disintegrated; and if any mould, however minute, by any means accumulates between the slates, there, too, they spring up, and even on the slates themselves. Tiles are often coloured yellow by such growths.
Here something occurs analogous to what we see in the higher animals after the removal of the kidneys; the urea at first contained in the blood, in imperceptible quantities accumulates and becomes manifest when the means by which it is eliminated disappear.
In the emu it accumulates all over the skin, but particularly on the rump, and between the shoulders, and round the sternal plate. To obtain the oil, we skinned those parts, and suspended them before a slow fire, and caught the oil in our frying pan; this was of a light yellowish colour, tasteless, and almost free from scent.
The carbon dioxid increase during exercise stimulates a greater circulation of oxygen in the tissues which later counteracts the normal increase in acid products. In inflammatory processes, however, the acid accumulates too rapidly to allow of saturation. In this case the circulation becomes slowed and the cells become affected.
The dust accumulates on the surface of our bodies much more readily, and adheres much more firmly, and in much larger quantities, than is usually supposed, and than by many would be credited. Mr.
Sometimes the dammar accumulates in large masses of ten or twenty pounds weight, either attached to the trunk, or found buried in the ground at the foot of the trees. The most extraordinary trees of the forest are, however, a kind of fig, the aerial roots of which form a pyramid near a hundred feet high, terminating just where the tree branches out above, so that there is no real trunk.
Once for all, however, in cases deeply rooted, no advances ought ever to be made but by small stages: for the effect, which is insensible at first, by the tenth, twelfth, or fifteenth day, generally accumulates unendurably under any bolder deductions.
Arsenic, which in the mother elects to accumulate in the liver, is in the fetus stored up in the skin; copper accumulates in the fetal liver, central nervous system, and sometimes in the skin; lead which is found specially in the maternal liver, but also in the skin, has been observed in the skin, liver, nervous centers, and elsewhere in the fetus.
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