398 Scientific Intelligence. 
(1.) A change of the plane of polarization of the heat rays can - 
be produced in solid and fluid bodies by electromagnetism, 
( he magnitude of this change is different for different sub- 
stances. The rotation is greater the greater the index of ieinaron 
of the substance 
(3.) The magnitude of the poration in diathermanous bodies is 
Bropertione! to the intensity of the current. 
The magnitude of the r petisn in a diathermanous body, 
eck between the poles of a magnet, is proportional to the 
magnetic force employed. 
(5.) It also increases with the length a the layer of the sub- 
stance: but this relation can not be computed from the length of the 
layer.—Ann. der Physik und Chemie, Nae 9,:1881, p. 85...J. 7. 
6. Klectro dynamic - Balance. —H. Hermnorrz provides an 
ordinary balance with two spirals of copper wire, in place of the 
ans. Beneath these spirals are also two spirals of larger radius. 
The terminals of these spirals are so arr anges that one of the 
movable spirals is attached and the other repelled. The conditions 
of sensibility are discussed and the author concludes that the cur- 
by magnetization.—V. Srrounat and ©, Barus confirm the obser- 
vation of Sir W. Thomson that a longitudinally megnetined iron 
wire is thermo-electrically more positive than a non-magnetic iron 
wire. ‘Their results show that the changes in the thermo-electric 
condition of iron can not be used to indicate the hardness of the 
iron or steel. e thermo-electric current between pieces of iron 
of different magnetic conditions flows in the opposite direction from 
that which arises between pieces of different degrees of -hardness. 
In other words it flows from the better conductor to the worse 
conductor.—Ann. der Physik und Chemie, No. 9, 1881 yp. 54. 3.7 
8. Principles of Chemical Philosophy ; by Jostau Parsons 
CooxE, feviae Professor of Chemistry and Wineeke:t in Har- 
yard Colle ege. Revised edition, 623 pp., 8vo. Boston, 1881, 
one All n).—The ped edition of Professor oe valuable 
hardly ae importa nt. The new edition. is written from this ad- 
rere principles in chemical philo acne 
. A Manual of Sugar Anes: including: the applications in 
Rae of the analytical methods to the Sugar Industry, with an 
Passduction on the Chemistry of 7 fosasleta Dextrose, Levulose 
