A Peculiar Clay from near the City of Mexico | Zendy

E. W. Hilgard | Zendy

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A Peculiar Clay from near the City of Mexico

Author(s) -

E. W. Hilgard

Publication year - 1916

Publication title -

proceedings of the national academy of sciences

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 5.011

H-Index - 771

eISSN - 1091-6490

pISSN - 0027-8424

DOI - 10.1073/pnas.2.1.8

Subject(s) - heterochrony , biology , progenitor cell , progenitor , transcription factor , cell fate determination , microbiology and biotechnology , identity (music) , neural stem cell , genetics , evolutionary biology , stem cell , computational biology , gene , physics , ontogeny , acoustics

that astronomical observers will probably be able to make a definite decision as to whether or not any of the existing spiral nebulae have developed from bacula or from less regular forms by substantially the same method. Till that is decided further discussion would be superfluous. It is possible that there are well developed spiral nebulae in which mutual interference has done little or nothing to reduce orbits to ellipses of small eccentricity. To such nebulae the analysis here indicated has no application, nor could their motions be formulated in the present state of science.9

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