KARL CHRISTIAN PLANCK (1819-1880), German philosopher, was born at Stuttgart on the 17th of January 1819.
Not only did Planck oppose the idealism of his confreres; his views were, in another aspect, directly antagonistic to the Darwinian theory of descent, which he specifically attacked in Wahrheit and Flachheit des Darwinismus (Ndrdlingen, 1872).
The natural consequence of this individuality of opinion was that his books were practically disregarded, and Planck was deeply incensed.
See Umf rid, Karl Planck, dessen Werke and Wirken (Tubingen, 1881); and Schmidt, "Das Lebensideal Karl Christian Plancks," in the Vortrdge der philosophischen Gesellschaft (Berlin, 1896).
It is then found both by experiment and by thermodynamic theory that in these amorphous radiations there is for each temperature a definite distribution of the energy over the spectrum according to a law which may be expressed by 0 5 0(OX)dX, between the wave-lengths X, A+dX; and as to the form of the function 4), Planck has shown (Sitzungsber.