lectures the ' Matterhorn ' diagram occupying page 148 of Appleton's edition of the lectures. These lectures it will be remembered were delivered many times among us during the winter of 1872-3. In the month of August 1872 Dr. Draper published in the leading scientific periodical of Great Britain a memoir which he not only repeated his belief that the method em ployed by Herschel and subsequent investigators must ne whelming array of observations disproving them. As for Professor Tyndall's estimate of the proportions of heat on the two sides of the ' extreme red' he held that ' they were valueless for lack of care in determining the point of divis ion.' The red light shades off gradually so that it is almost, scientific american, 1874-02-28
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