418 Scientific Intelligence. 
spectra obtained (copies of which will be appended to the printed report) 
there appears to be evidence of the conversion of one form of force into 
another—the change, indeed, of light into actinism or chemical power ; 
and, again, as in Mr. Stokes’s experiments, the exhibition of the ordin- 
arily invisible chemical rays in the form of Zight. 
r 
Magnetical Investigations ; by the Rey. Wm. Scoressy, D.D., 
F.R.S., L. and E., &c. Vol. ii, 448, pp. 8vo, with illustrations. Lon- 
izing the inductive influence of the eatth’s magnetism ; (4.) on the de- 
velopment of magnetical properties by percussion in steel and iron, as 
aided by contact with iron bars previously magnetized by hammering ; 
(5.) indications explanatory of certain peculiar magnetic phenomena, 
changes to which their magnetic condition is liable, which is treated at 
-H. W. Dove: Darstellung der Farbenlehre und optische Studien ; 
288 pp. 8vo, with 2 lithog. tables. Berlin, 1853. 
Il. Geonoey anp Panzonrotoey. 
1. Ueber die Vulkanischen Gesteine in Sicilien und Island, und thre 
submarine Umbildung von W. Sartoxivs von WaLTERSHAUSEN. 532 
] 
100 pages of the work (pp. 16-105). Other minerals are taken up in 
order and also the rocks, and many new analyses are given. a 
