“…Stempell(1929) discovered the phenomenon and attributed it to mitogenetic radiation; Tokin (1931,1933) (Tokin and Baranen kowa, 1931) found that volatile substances were responsible. (See also Czaja, 1930;Gigon and Noverraz, 1930;Maxia, 1930Maxia, , 1931bYpsilanti and Paltauf, 1930;Kowarzyk, 1931 ;Siebert, 1931). Stempell and von Romberg (1931) and Kofman (1932) insist that effects due to radiation can be found when chemical effects are excluded (see the article by Maxia,19pa).…”