Electric conductivity in constant streams

Romoaxohes, i ~ F e e b l e Magmetimm.,-P. Silow reports results of his investigations in the laboratory of Prof. Helmholtz, fo~ determining the absolute vMtm of the magnetizing constant of fluids, He starts from the considerations, that the study of strongly magnetized bodies shows the insufficiency of Poisson's hypothesis; that the ratio of polarizing to magnetizing power is independent of the latter, and is of a constant magnitude ; and that in weakly magnetized bodies, especially in fluids, only a temporary polarization occurs He refers to the researches of W. Weber, Toepler and v. Ettingshausen, and G. Wiedermann, as confirming Poisson's first hypothesis, and as establishing laws relative to the influence of the magnetizing power, of the concentration, of the solvent, etc. He admits that the deviation of some of the results from the mean is considerable (in one instance '138), but considers them satisfactory in view of the delicacy of the measurements.--Ann, d. _Phys. u. Chem., 237, 481, aeq. C. N e w E l e c t r i c a l Law.--Clausius announces the following general law, of which many of the known laws of electrical reciprocity are immediate consequences: Suppose any number of conductors, C~, 5~2, Gs, which neutrally influence each other. Let them be charged with electricity in two different ways; at the first charge, let the respective quantitms in the different bodies be Q1, Q2, ~3, etc., and the resulting potential levels /71, /72, /73, etc. At the second charge let the corresponding values be ~1, Da, ~s, etc., !~t, !~2, !~3,etc. Then we shall find : or, taking the sums, ~v /7 ~ ~ ~v !8 Q.--Ann. d. _Ph. u. Gh., 237, 493. C.

Electric Conductivity in Con~a~at St~&m~--F. Kokt~ausch and O. Grotrian (Pogg. Ann., cliv and clix) have found values for the electric conductivity of fluids with variable streams. J. Tel, linger has experimented with nine different solatians in constant streams. The percentage of the soluble ingredient varied betw~e~ 2"5 and 94"5 ; the resistances, betw.een 27"96 and 255"47. The dig ferences in the results, as. measured in constant an&. in variable streams, range betw~ext "1 aud 1"3 per eeat..-~n~ d~. ~h. u, 0~,. 237, 514. O.