View Article Online SOLAR RAYS BY ATMOSPHERIC OZONE. 113 extinguished. Under such circumstances, in judging of the absorptionspectrum of ozone, I am led to believe that nearly the maximum effect is produced when all rays are absorbed with a wavelength less than 293 millionths of a millimeter, and that the larger additions of ozone would only slightly increase the range of absorption. We may reasonably suppose that the atmospheric ozone, even if immeasurably greater in quantity in the layer of the atmosphere through which we observe the sun, would not shorten the spectrum much more than the highly charged layer of oxygen only 3 feet in thickness, used i n the preceding experiments. The extreme limits of the solar spectrum transmitted by the atmosphere, as observed by M. Cornu, under the most favourable conditions, are the following :-18'79.

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held 450 C.C. or little more than half a gram weight of the body. The acetylene was prepared from cuprous acetylide by the action of hydrochloric acid. An absorption of the extreme rays extending only as far No absorption-bands were noticed in any case.