238 Scientific Intelligence. 
1883, pp. 1551-1553. J, T. 
8. Heat in iron due to periodically changing magnetic force. 
—The heat noticed has been attributed by some investigators to 
the movements of the magnetic molecules, and hence has been 
called heat of magnetic friction. Other investigators think that 
this heat is due almost entirely to electro-magnetic induction in 
the mass of iron. E. Warsure and L. Hénic have taken up the 
subject and their experiments lead them to believe that a large 
of the heat is due to magnetic friction. The magnetizing 
single cycle, was greater than two. e authors examined the 
sources of error might arise from the change in character of 
the temporary permanent magnetism due to change in direc 
der Physik und Chemie, No. 12°, 3, pp- —835, peauuaers 
9. ciples of Theoretical Chemistry, with Special reference — 
to the Constitution of Chemical Compou Ina Kensie” 
’ . ? mrtg ae 
adelphia, 1883. Henry C, Lea’s Son & Co.—This excellent little e 
bogk of Professor Retsen’s may fairly be considered a protest — 
uttered against the now prevalent notion that. the science © 
page 100, is as follows: “It cannot be denied that we are now} on 
a period of Chemistry which may fairly be called one of for” re 
worship. By weaker minds more value is attached to a formu 
