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    • Photochromism of o-Nitrotoluenes - Nature

      Nature· 3 days ago

      THE crystals of 2-(2′,4′-dinitrobenzyl)-pyridine (I), which are colourless when kept in the dark, turn blue when exposed to light1. Hardwick, Mosher and Passailaigue1 by using a cryoscopic technique ...

    • Scientific Serials - Nature

      Nature· 3 days ago

      The changes of density at the nodes of open and closed organ pipes were recorded by allowing a beam of strong white light to fall upon the mirror of a Jamin ...

    • Fertilisation of Flowers by Insects * - Nature

      Nature· 3 days ago

      When the flower has just opened, its two upper Eetals are light violet, or, in rarer cases, nearly white; ut they gradually become a deep violet, or even dark blue. Far more striking is, ordinarily ...

    • Societies and Academies - Nature

      Nature· 3 days ago

      At a point near γ 5780 the hue remains unaltered by the addition of white, and it is towards this point in the spectrum that the colours on each side of it travel. It is pointed out that this ...