Note 153 — SYSTEMATICS AND HISTORY

Quite recently Kammerer (Arch. Entw. Mech. 25, 1907, p. 7) has published very important experiments on the inheritance of “acquired” modifications with regard to the peculiarities of reproduction in Salamandra atra and S. maculosa. It seems rather improbable—though not absolutely impossible—that the germ cells were directly affected by the external modifying agent in this case.