Proceedings of the American Academy of Arts and Sciences, 20권American Academy of Arts and Sciences., 1885 |
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33개의 결과 중 1 - 5개
27 페이지
... blastodisc becomes two cells deep , and on this account it be- comes extremely difficult , beyond the latter stage , to trace the genesis of the individual cells in the living egg . By the aid of mounted prep- arations we have found it ...
... blastodisc becomes two cells deep , and on this account it be- comes extremely difficult , beyond the latter stage , to trace the genesis of the individual cells in the living egg . By the aid of mounted prep- arations we have found it ...
28 페이지
... blastodisc . 2. Mounted preparations of the blastodisc , in every stage of de- velopment from the time when the pronuclei appear up to the time when the germ - ring begins to form , were made in large numbers . have experimented with ...
... blastodisc . 2. Mounted preparations of the blastodisc , in every stage of de- velopment from the time when the pronuclei appear up to the time when the germ - ring begins to form , were made in large numbers . have experimented with ...
32 페이지
... blastodisc and the periblast , at first continuous , soon part company without the direct intervention of cleavage . In these respects this ovum repre- sents a higher type than does the elasmobranch ovum ; but there is another respect ...
... blastodisc and the periblast , at first continuous , soon part company without the direct intervention of cleavage . In these respects this ovum repre- sents a higher type than does the elasmobranch ovum ; but there is another respect ...
33 페이지
... blastodisc of the teleostean ovum , during the early stages of cleavage . It is the same influence which causes the germinal protoplasm to concentrate in the form of a polar disc , and to thicken up until it forms a sort of calotte ...
... blastodisc of the teleostean ovum , during the early stages of cleavage . It is the same influence which causes the germinal protoplasm to concentrate in the form of a polar disc , and to thicken up until it forms a sort of calotte ...
40 페이지
... blastodisc lies at the upper or lower pole , but also in those exceptional cases noticed by Ryder and others where it lies at one side of the vitellus ? If the cleavage - plane must follow the direction of gravitation in the first ...
... blastodisc lies at the upper or lower pole , but also in those exceptional cases noticed by Ryder and others where it lies at one side of the vitellus ? If the cleavage - plane must follow the direction of gravitation in the first ...
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Abdomen abdominal appendages Acad acetic acetic acid acid acute Antennæ anthracene appears areola Astacus Barrande base Bentham blastodisc blastomeres border Boston bracts branches broad California calyx Cambarus Cambridge carapace cells Cephalothorax cervical groove chela ciliate cleavage cleavage-plane collected corolla difference of potential Dikelocephalus dorsal Emmons entoderm Eritrichium faune feet flowers foliis fossils fruit genera genus glabrous Graptolites Gray gynobasi Hagen inches long lateral leaflets leaves length less limestone lines long lobes longis Magn male margin maxillipeds median Mountains nearly nuclei Nuculæ nutlets oblong observations Olenus ovum pair of legs papillæ Paradoxides pedicels periblast petioles plate Point Lévis posterior Potsdam precipitate Primordial fauna Proc pubescent punctate ring River rostrum sæpius sandstone schists second fauna segment sepals short side Silurian slates slender somites species specimens spermogonia spines stars superficial tension surface Taconic system telson third tion Trilobites tube upper ventral