Miscellaneous Intelligence. 451 
21. Brechung und Reflerion des Lichts an fh ince optisch. 
einaxiger volkommen durchsichtiger Medien, von Dr. JoseeH GRatLicn, 
Privat-Docenten an der Wiener Universitit, Pion the 9th volume of 
the Mathematico-natural History Section of the Royal Academy at Vienna. 
1856 and 1856. Dr. Grailich is a profound mathematician and 
cist, and in two papers has discussed the subject of the refraction and 
— of light in twin crystals with great ability. 
. Abhandlungen der k. k. Ge ologischen Reichsanstalt, Band IIL— 
This 3d volume of Transactions from the Geological Survey of Austria or 
rather the Geological Department under the Austrian government, i 
oceupied solely with a memoir on the Molluscan pg = the Tertiary of 
Vienna by Dr. Moriz Homes with the assistance of h. tt is 
q a magnificent work in 736 quarto pages illustrated by ‘52 eryiialts fithos 
graph plates of crowded figures, the beauty of which can hardly be ex- 
eded. This work is the first Yoluine ier of the o. rae i 
the Univalves, The Bivalves remain for another v r. Hor 
q sete Adjunct” of the Royal Hot. Minsdeal Cabinet, of which Partsch 
Ee “eC 
~ Tahriruch der k. k. Geol. a ani petapi's 1855, No. 4, and 1856, 
dediiesations. Each number, of which four appear annually, extends to 
— two and tlree hundred pages. 
Prodromus deseriptionis Animalium Evertebratorum, &c., of the 
North Pacific Expedition under Captain Rodgers, by W. Sr IMPSON.— 
This pamphlet of 13 pages 8vo, contains brief descriptions by Mr. Stimp- 
- Son of fiftty-two species of Zw rbellaria Dendrocela collected a him in the 
course of the North Pacific cruise on the Coasts of Asia 
and adjoining islands. 
C. F, Rammetsserc: Die neuesten Forschungen in der krystallo- 
graphischen Chemie, as supplement to his Handbook on Crystallographic 
Chemistry, 227 pp. 8vo, with numerous woodcuts. Dr. Rammelsberg is 
performing an excellent service for science in seit! together the facts 
in a eee chemistry. 
j 5. Ruhmkorf’s Apparatus constructed by) E. S&. Ritchie of Boston, 
: (Pron a letter to J. D. Dana from Prof. W. B. Rogers, dated Boston, 
4 April 16, 1857.)—You will I know be interested ps agts that Mr. E. = 
+ Ritchie, the well known instrument maker of this ci ueceed 
‘ - 
i rpass the Paris instruments, and, so far as iainted with 
| their action, to compare favorably with the recently pspioved form intro- 
| duced in England. After encountering yt difficulties in the insula- 
tion of the coil as well as the const the condenser and break- 
piece, he has devised such arrangements in regard to each as to secure 
a dense continuous spark, between the terminals of the s secondary wire, 
of from 2 to 24 inches long, and to permit the means of exhibiting all 
the effects of the discharge on a 8¢ scale and with a brillianey truly superb. 
The Sse of light in vacuo transversely strat tified or waved, Gassiot’s 
cascade, and other effects which I have found it to produce, and which 
we have exhibited at the Warren Club and elsewhere, are among the 
most magnificent electrical displays which I have ever seen, The primary 
