470 Proceedings of Philosophical Societies. [June, 



Structure of the Whale ; a description of an ingenious Appa^ 

 ratus for Jiltering out of Contact with the Atmosphere, by Mr. 

 Donovan, and several others. In the Review department, we 

 have particularly to notice an excellent account of Mr. Daniell's 

 Meteorological Essays, in which, though the critic does not 

 always agree with his author, much well merited praise is 

 bestowed on that very interesting volume. The review of a 

 book called The Young Brewer's Monitor, is pretty severe (not 

 unjustly so, however, as it should seem) and very entertaining, 

 and a good specimen of the ridiculnm acri, as well as the sub- 

 sequent one on Broicn's Principles of the Differential Calculus. 

 In our next number we intend lo make our readers more 

 intimately acquainted with some of the articles in this promising 

 journal. 



2. New Magnetic Phenomenon. 



At the sitting of the Royal Academy of Sciences of Paris, 

 on the 7th of March, M. Arago exhibited an apparatus for 

 showing, in a new form, the action which magnetized and non- 

 magnetized bodies mutually exert on each other. 



In his first experiments, M. Arago proved, that a di?c of 

 copper, or any other solid or liquid substance, placed beneath a 

 magnetic needle, affects the extent of its oscillations, without 

 sensibly altering their duration. The phenomenon in question 

 may be considered as the converse of the preceding. Since 

 a needle in motion is stopped by a disc at rest, M. Arago 

 imagined that a needle at rest would be moved by a disc m 

 motion. In fact, if a plate, of copper for instance, be made to 

 turn with any determinate velocity under a magnetized needle 

 contained in a perfectly closed vessel, the needle will no longer 

 assume its usual position ; it stops without the magnetic me- 

 ridian, and so much the farther from that plane as the revolu- 

 tion of the disc is more rapid. If the rotatory motion be suffi- 

 ciently rapid, the needle itself, at whatever distance from the 

 disc, turns continually round the wire on which it is suspended. 

 ' — {Annales de Chimie.) 



3. Hyana Caves in Devonshire, 



Professor Buckland has lately examined two caves in De- 

 vonshire, in both of which he found, in a bed of mud beneath 

 a crust of calosinter, gnawed fragments and splinters of bones, 

 with teeth of hysenas and bears. There were no entire bones, 

 except the solid ones of the toes, heels, &c., as at Kirkdale, 

 which were too hard for the teeth of the hysena. They appear 

 simply to have been dens, but less abundantly inhabited than 

 that at Kirkdale. In the same cave. Professor Buckland found 

 one tooth of the rhinoceros, and two or three only of the 

 horse. — (Edin. Phil. Journ,) -' 



