V8 SCIENTIFIC J^EWS. 



of Plautus, every thing which relates to the knowledge of 

 men and things in his time, so as to exhibit an outline of the 

 civilization and manners of that period. 



The question concerning the absolute or relative tempe* 

 ^oterior tempc raturc of the interior parts of the earth, has been long agi- 

 Srth^. ^ ^ ^ tated, though it now appears to be decided that our globa 

 contains no internal source of heat, if we except the occa- 

 sional combustions of rolcanoes. 



Mr. De Trebra, captain of mines at Freyburg, and Pro- 

 fessor Lampadius, have directed some experiments to this 

 object. They placed two thermometers of Reaumur at dif- 

 ferent depths in the mines, and compared them twice a day 

 with one exposed ^o the atmosphere. One of the subterraneous 

 thermometers stood constantly at 12® and the other at 9 J 

 Mr. De Trebra, who intends to repeat and vary these expe- 

 riments, purposes likewise to make some others relative to 

 the theory of Dr. Benzenburgh on the fall of bodies. 



I Galvanism and Magnetism, 



"Professor Rilter has communicated to the Royal Aca* 



Rjtt«r's Ixpe- demy of Sciences, of Munich, in one of its sittings last year 



RlTgnctism. ^ course of experiments, referimg 4iiectly to the nature of 



magnetism. 



In the years 1776 and 1777, the Academy had already 



proposed questions on this subject, and the scientific world 



was busied in considering the relations which might .exist 



bet-ween electricity and magnetism. 



The following are the results of the experimentsof Ritter, 



Ccneralfacts. ^s abridged by Professor Miilin in his Magasin Encyclo- 



pedique for May last. 



1. Every magnet is equivalent to a pair of heterogenous 



TheWagnetact« jj^g^^lg united tojicther; its different poles represent as it 

 like two metals o ' * * 



were different metals. 



. 9, Like them, it gives electricity ; that is to say, one of 



electricity. the two polcs, the positive electricity, and the other the 



negative. 



3. By 



