422 Intelligence and Miscellaneous Articles, 



sophers ; let us, however, recall to mind how very quickly they got 

 intelligence of magneto-electricity : but how the discoveries of 

 Mr. Faraday could be so unknown or wilfully passed over in Paris, 

 that a year later the treatise of Mr. Matteuci could be brought be- 

 fore the public, without a single comment, is truly incomprehensi- 

 ble. To science it is, indeed, indifferent by whom its boundaries 

 are enlarged (although nobody acknowledges the truth of this 

 maxim when his own interest is concerned) j but a discovery of 

 such importance as this last of Mr. Faraday's, undoubtedly the only 

 real advance in our knowledge of the chemical action of electricity 

 since 1800, the year of the discovery of the decomposition of water 

 by the battery, such a discovery does at least require some grati- 

 tude towards ifs originator, and the public acknowledgement of his 

 well-founded right of priority is surely the smallest tribute of 

 thanks that can be paid him." —Poggendorffi 



KUPFER-ANTIMONGLANZ. 



This mineral has been discovered by M. Zinken, in the Wolfsberg 

 mine, already celebrated for the specimens of 



antimony glance, bournonite, zinkenite, and ^ - sA 



rosenite or plagionite, which it affords. The fey 



specific gravity of kupfer-antimonglanz is V J 3 



4748, hardness 3*5. Lustre, metallic ; co- h & 



lour, lead grey — iron black. Form, prismatic ; 



cleavage parallel to c and b, the latter being very perfect, g g = 1 35°* 1 2, 

 gg= 111,.... gb = \\2'24,gbz= 129-30, cb=z 90°; 6 is streaked 



22 2 2 



parallel to its intersection with g. According to H, Rose the com- 



2 / "/ 



position of this mineral is expressed by the formula Cu + Sb. — Pog- 

 gendorff's Annalen. 



REMARKS ON A PECULIAR STATE OF POLARITY INDUCED IN 

 SOFT IRON BY VOLTAIC MAGNETISM. BY E. M. CLARKE, 

 MAGNETICIAN. 



To Richard Taylor, Esq., F.L.S., fyc. 

 Sir, 



Having in the }'ear 1833, being occupied in various experiments 

 to produce locomotion by means of voltaic magnetism, I observed 

 various interesting facts ; one was, that when a bar of soft iron was 

 placed in contact with one limb of a voltaic magnet (commonly 

 called an electro- magnet,) it partakes of its peculiar polarity N. or 

 S. throughout, as indicated by the invariable position of a mag- 

 netic needle whenever brought in approximation with it, an effect 

 strikingly at variance with received opinions on the subject. This 

 law appears to hold good, as far as I have experimented, with 

 several additional bars in various trying positions, as may be seen 

 in fig. 1 . 



