He delivered an exposition of his ideas in a lecture on January 13 , 1908 , before the Verein für vaterländische Naturkunde in Württemberg ( Society for the Natural History of the Fatherland in Württemberg ) , about six months before Hardy 's paper was published in English .
He delivered an exposition of his ideas in a lecture on 13 January 1908 , about six months before Hardy 's paper was published in English .