...There is no flint to make celts, but quartz and rocks havinga slaty cleavage are abundant...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...Inten eggs (KU 62154 from San Salvador, El Salvador) the average diameterof the embryos in first cleavage is 1...
William E. Duellman 「Neotropical Hylid Frogs, Genus Smilisca」
...The enormous cleavage of the rocks, the appalling cracks and fissures, the rent boulders, the smitten granite floors, gave one a new sense of the power of heat and frost...
John Burroughs 「Birds and Bees, Sharp Eyes and, Other Papers」
...Here we havethe simple form of direct cleavage of the nuclei...
Ernst Haeckel 「The Evolution of Man」
...The same direct cleavage of the nuclei is also witnessed in thereproduction of many other protists, while other unicellular organisms show theindirect division of the cell...
Ernst Haeckel 「The Evolution of Man」
...In these the multiplication of individuals takes place byunsexual reproduction, which takes the form of cleavage, budding, orspore-formation...
Ernst Haeckel 「The Evolution of Man」
...But all the otheranimals—all the tissue-forming animals, or metazoa, as we callthem, in contradistinction to the protozoa—construct real germinal layersby the repeated cleavage of the impregnated ovum...
Ernst Haeckel 「The Evolution of Man」
...When the cleavage is thus ended, the mulberry-like mass changes into a hollowglobular sphere...
Ernst Haeckel 「The Evolution of Man」
...In these cases the cleavage of the ovum begins atthe upper pole, and leads to the formation of a dorsal discoid embryo...
Ernst Haeckel 「The Evolution of Man」
...All these and manyother classes of animals generally agree in the circumstance that insegmentation theirovum divides into a large number of cells by repeated cleavage...
Ernst Haeckel 「The Evolution of Man」
...In these thegastrulation proceeds in two phases, as Semon rightly observes: firstly,formation of the entoderm by cleavage at the centre and further growth at theedge; secondly, invagination...
Ernst Haeckel 「The Evolution of Man」
...Byrepeated cleavage of it a morula is formed, and from this a blastula, whichchanges in a very characteristic way into the greatly modified gastrula...
Ernst Haeckel 「The Evolution of Man」
...(As to the womb and oviductsee Chapter XXIX) The cleavage and formation of the gastrula take place in theoviduct...
Ernst Haeckel 「The Evolution of Man」
...The individual as such is annihilated in the act of cleavage (cf...
Ernst Haeckel 「The Evolution of Man」
...From it is developed in the same manner in all thePlacentals, by repeated cleavage, a multicellular blastula...
Ernst Haeckel 「The Evolution of Man」
...A cleavage in the rocks made a narrow crack to the outside world, andthrough it the starlight filtered dimly...
Various 「Astounding Stories, May, 1931」
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