Article PDF
Rights and permissions
About this article
Cite this article
British Association for the Advancement of Science. Nature 187, 646 (1960). https://doi.org/10.1038/187646a0
Issue Date:
DOI: https://doi.org/10.1038/187646a0
Nature volume 187, page 646 (1960)
British Association for the Advancement of Science. Nature 187, 646 (1960). https://doi.org/10.1038/187646a0
Issue Date:
DOI: https://doi.org/10.1038/187646a0