...Like all these sand-rivers, it is for the most part dry; but by digging down a few feet, water is to be found, which is percolating along the bed on a stratum of clay... 
David Livingstone 「Missionary Travels and Researches in South Africa」
...—The upper stratum of clouds is from the north-west,the lower from the south-east; when they mix or change places thetemperature is much lowered, and fever ensues...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...lower stratum into S...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...The outer stratum is the skin-layer, or ectoderm(Figs...
Ernst Haeckel 「The Evolution of Man」
...i largerand darker cells of the inner stratum, the vegetal layer or entoderm...
Ernst Haeckel 「The Evolution of Man」
...But these aresecondary additions, and the inner germinal layer is a simple stratum of cells...
Ernst Haeckel 「The Evolution of Man」
...But soon there appears in the middle of the circulardisk between the two a third stratum of cells, the rudiment of the middle layeror fibrous layer (mesoderm)...
Ernst Haeckel 「The Evolution of Man」
...The outer skin is very thin and delicate, naked, transparent,and composed of two different layers, a simple external stratum of cells, theepidermis, and a thin underlying cutis-layer...
Ernst Haeckel 「The Evolution of Man」
...The outer stratum of cells, orthe non-invaginated part of the blastoderm, is the ectoderm, the outer oranimal germ-layer, which provides the outer skin (epidermis) and the nervoussystem (e)...
Ernst Haeckel 「The Evolution of Man」
...But fromthe thickness or size of the stratum we can draw some conclusion as to therelative length of the period...
Ernst Haeckel 「The Evolution of Man」
...Afterwards there are slight histological differentiations in itsectoderm, though the entoderm remainsa single stratum of cells...
Ernst Haeckel 「The Evolution of Man」
...It comes from the outermost parietal stratum of themiddle germinal layer, or the skin-fibre layer...
Ernst Haeckel 「The Evolution of Man」
...The follicle-epithelium of the mammal has at first one stratum (Fig...
Ernst Haeckel 「The Evolution of Man」
...Thereupon the pre-historian must fall back on the general run, ortype, in assigning the different implements each to its own stratum...
Robert Marett 「Anthropology」
...The flint-bearing stratum of the Harrison County aboriginal quarriesoutcrops a short distance away and appears at several points withinthe cave...
Gerard Fowke 「Archeological Investigations」
...The cavities are in a stratum which is somewhat shelly and crumbleseasily...
Gerard Fowke 「Archeological Investigations」
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