Archive image from page 42 of A cultural table of orchidaceous. A cultural table of orchidaceous plants culturaltableofo00coxj Year: 1946 ( waves of varying length and intensity or speed. Not all the rays which make up the sun's radiation reach the earth. If they did happen to do so, even for so short a time as one second, it is likely that every living organism on the earth would be destroyed, and possibly our planet itself would be burned to ashes. Fortunately (or having regard to the mess into which humanity has got itself, perhaps un- fortunately), most of these rays are absorbed first by
Archive image from page 42 of A cultural table of orchidaceous. A cultural table of orchidaceous plants culturaltableofo00coxj Year: 1946 ( waves of varying length and intensity or speed. Not all the rays which make up the sun's radiation reach the earth. If they did happen to do so, even for so short a time as one second, it is likely that every living organism on the earth would be destroyed, and possibly our planet itself would be burned to ashes. Fortunately (or having regard to the mess into which humanity has got itself, perhaps un- fortunately), most of these rays are absorbed first by the comparatively narrow belt of ozone which lies like a blanket round our atmosphere, second, by the at- mosphere itself, and, third, by the clouds, dust, vapour and other impurities which, though unseen, crowd the air about us. As the result of these barriers only a very limited number of rays outside the visible ravs succeed in penetrating through to the earth's surfaceâand these invisible rays are a fraction of the infra- red rays, and a fraction of the ultra-violet raysâmodifications of each of which are represented by the red and violet rays which comprise the two ends of the spectrum or visible light rays as shown in the enlarged section at the bottom of the diagram. RAMO WAVES VISfBLE UOfT â «AVS I MFAA RADlAT/ONOf I eARTHS - 1 ULTRA WOL£T >i)iUivf/\Jl A (Uyi GAMMA lAyS FROM rlATFtR COSMIC HAysl?) SOLAR RADIATION THE SPECTRUM OF VISIBLE LIGHT VISIBLE LiGHTRA\S REACHING TWE EARTH AT THE RATE OF SATO BILLIONS PER SECOND We know that the solar energy received by the earth is not constant, in so far as it varies in different parts of the world, and at different times of the year, not only in its duration, but in its intensity and its quality. Thus at the equator we have days which are divided almost equally into darkness and light, while in the distant latitudes we find that in summer the days have light for anything up to 24 hours and in winter th
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