(Evelyn, 1649; Dumas, 1840; Jetzold, 1942; Des Cloiseaux, 1855; Damour, 1856; Brewster, 1861; Cohen, 1876; Boutan, 1886; Bauer Spencer, 1904, Crookes, 1909; Cattelle, 1911; Escard, 1914; Wagner, 1914; Sutton, 1921, 1928; Spencer, 1924; Friedel, 1923; Colony 1923; Cor-rens, 1931; Williams, 1932). . , . , .

, , , . .