Chemistry and Physics. 417 
such substances as ferrous sulphate, alkaline solution of arsenious 
acid, and aqueous solutions of h 
proceeds more rapidly in the ‘light t than in oe Sax k, and he 
endeavors to estimate the action of the light by the diferencs in 
the pelea of the process in the two cases under otherwise like 
as we an fuse the red to the violet end of th 
co 
the air and light a direct effect of oxidation caused by the sun’s 
rays, and this effect is produced chiefly, if not wholly, by the more 
retrangible rays,— Ann. Chim. et de Phys., V, xi, 145. 5. P. 0., IR 
c rotatory Po laregion: —M. Henet rt BecQuEREL has 
cs 
<8 
S 
dS 
cannot be stated in a few words. The most important genera 
conclusions are the followin 
~ That thé positive rotation of the plane of polarization of a 
ray of “Tight having a definite wave-length, in passing through the 
unit of thickness of a diamagnetic mat terial under the influence of 
index of refraction, an factor depending on agnetism 
and on the diamagnetism of the body, this factor jaca h 
prop a substances are magnetic. 
2.) That with substances chemically allied or containing the 
same radical the qu tient the ma rotation, and the cor- 
responding value of n2(n? —1), varies yey slightly: (3.) That the 
chemical nature of the substance exerts an important influence on 
8 phenomenon, and that the several conaadbeotien of a compound 
roduce an independent effect. (4) That when in solution 
the specific effect of the molecules o Vorunes bodies is not 
cerita by the concentration of the solution, while that of the 
lecules of magnetic bodies may be greatly affected by the 
he tee —THIRD ios Vou. XIV, No. 83.—Nov., 1877. 
