122 Correspondence of J. Nicklés. 
water it was plunged into cold water; this restored the rigidity of the 
feather previously swollen by the warm water. ; 
Schr 
stances could be indefinitely preserved, if instead of leaving such matter . 
in common air, they were placed in vases filled with air that had been — 
Mr. Schroeder shows that what he has established concerning fermen 
tation and putrefaction, is also true of crystallization. It is well known 
that a saturated solution of sulphate of soda remains liquid as long asit — 
is in vacuo, but solidifies on access of air. Mr. Schroeder establishes the 
fact that crystallization does not take place if the air is made to pm 
through a tube filled with cotton.* A 
ed the results of his experiments in 1854 by supposing 
r. 8. explain 
that the air filtered through cotton is deprived of the spores of eryptog® — 
ne 
Before my investigations, only two kinds of magnets were known, ik 
straight and the horseshoe or bifurcate+ In 1852 I made known ie 
trifurcate magnet, (or magnet with three poles having only a single b a “ 
for magnetization although possessing considerable attracting powers) last i 
the paracircular magnets,{ and afterwards the circular. § ee 
two kinds have some special properties, and are capable of transmitting 
motion as the revolution takes place, but the magnets which I call ev ge 
are polished at the circumference and without teeth. These magnets ™ 
tracted much attention on account of their peculiarities and pre a 
applications. One of them has been put in action on a large scale ‘ 
the Lyons railroad. 3 
any from France. This is owing principally to the fact that Associ pee 
are in session in England, France, Italy and Germany at nearly the 84° 
* Journal de Pharmacie and de Chemie, 1854, T. xxv, p. 314. 
} This Journ., xv, 104, 380. } Ibid, xvi, 110. § Ibid, xx, 99. 
