Tropisms of Mammals.

We see then that here, just as in the case of diatomic molecules, the permanent moment of the molecules and the part of the dielectric constant due to it are related by Debye's equation derived on the classical theory provided the temperature is sufficiently high. As regards the behavior of the bands emitted by dipole-molecules of the kind considered in an electric field, there should be a linear Stark effect for all lines arising from transitions between states for which n is different from zero, as may be seen directly from (7) and (3). The deflection of the molecules in an electric Stern-Gerlach experiment of the kind described in the previous paper' can be easily predicted, too, by introducing the value of P determined by equations (4), (3) and (5) into the formula for the deflection. I R. de L. Kronig, Proc. Nat. Acad. Sci., 12, 488, 1926. See also L. Mensing and W. Pauli, Phys. Zs., 27, 509, 1926; J. H. Van Vieck, Nature, 118, 226, 1926. 2 D. M. Dennison, Phys. Rev., 28, 318, 1926. 3 M. Born, W. Heisenberg and P. Jordan, Zs. f. Phys., 35, 557, 1926.