Plant Distribution in Lower California [editorial]

Charles R. Orcutt
1884 Science  
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more » ... out Early Journal Content at http://about.jstor.org/participate--jstor/individuals/early-journal--content. JSTOR is a digital library of academic journals, books, and primary source objects. JSTOR helps people discover, use, and build upon a wide range of content through a powerful research and teaching platform, and preserves this content for future generations. JSTOR is part of ITHAKA, a not--for--profit organization that also includes Ithaka S+R and Portico. For more information about JSTOR, please contact support@jstor.org. 4 SCIE would seem well-nigh incredible that the upper currents and the power of suspension of the ashes could have combined in carrying the particles 11,000 miles. Common cloud-coloring is caused by diffraction from particles of dust or water-droplets. Light of different wave-lengths has a greater or less power of passing through dust, smoke, water-droplets, icespiculae, etc. It is stated that the light at the blue end of the spectrum has less power of penetration than at the red end: hence the light is sifted out, as it were; and the blue disappears first, then the orange, and, last of all, the red (Scott's ' Meteorology,' p. 205). Why may it not be possible that the blue, having the greater refrangibility, is refracted to such an extent as to be intercepted by the earth long before the red has disappeared? Taking into account the great abundance of moisture, the appearance of ice-spiculae (which, however, may have been volcanic ashes), and the fact of the appearance being precisely'similar to that ordinarily seen upon clouds, there is no necessity of resorting to the at best doubtful theoly of the volcanic origin of the phenomenon. The similarity between. the ordinary sunset and this phenomenon was finely illustrated one evening by a magnificent red-cloud sunset, manifestly caused by clouds comparatively near the observer. These clouds, gradually fading away, were followed by the deeper red so prominently noticed recently, and evidently produced by ice-spiculae at a great distance. G. A. N.
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