148 Scientific Intelligence. 
regarded as perfectly homogeneous. The writers consider that the 
apparatus which they used will be of value in testing the perfect 
eee of insulating bodies.—Phil. Mag., June, 1881, p. 
I, 
i Transmission of radiation of low refrangibility through 
Kbonite.—Captain Abney and Colonel Festing have repeated 
ue ase of Professor Bell which showed that invisible 
j ow refrangibility, pass through ebonite, by 
axponis a sensitive photographic plate to these radiations. 
An image was formed in many cases and the writers Aeneas 
that the coéfficient of absorption of a plate of ebonite gi of 
inch in thickness is equal to 1°8 and that any rays which can 
penetrate through { of an inch of ebonite will only have an in- 
tensity of soo Of that of the resultant beam without deduct- 
ing anything for the scattering of the light. It is concluded 
“that ebonite when of small thickness transmits to some extent 
the rays of low refrangibility.”.—PAzl. Mag., June, 1881, D. baa 
7. Conservation of Electricity —M. G. Lippmann Gatnie 
his paper on this subject—see Comptes Rendus, May 2, 1881— 
and maintains that the principle of the conservation of elec- 
tricity stands in the same relation to electricity that Carnot’s 
principle stands to heat.— Comptes Rendus, p. 1149, No. 20, oe 
6, Soe 
. Heating of Ice.—A. Wiillner repeats the Se Di iouta ‘of 
Ciaaclioy: and sae ‘that so lon ng ag? the bulb of the ther- 
mometer is wholly surrounded with ice the thermometer indicates 
no temperature above —3° C. The thermometer with its bu 
sebviae d and thus the temperature of the air in the test tube 
could be modified. When this air was heated by a Bunsen 
burner the thermometer rose quickly to ~—3° C. e ice vapor- 
ized quickly ; when the bulb of the ‘has mometer ceased to be 
completely surrounded by ice the temperature rose to 0° C., and 
when the thermometer bulb becam 1e more free from ice the tem- 
and pieces of ice still be observed hanging to the thermometer 
bulb.— Wied. Annalen der Physik und U emie, No. 5, 1881, p- 
r. 
105, J. 
9. Atomie nee of Cadmium.—Mr. OrivErR W. HuntINnc- 
ron, of Harvard, has made a study of the atomic weight © 
cadmium, following the method used by Prof. Cooke with: refer- 
ence to antimony. “The mean result from his first series of experi 
ment is 112°31; and from a second, 112°3 
