224 Scientific Intelligence. 
air may be expressed by a hydrostatic pressure, and thus K,—1 
be .’ The magnetic fields employed by hninis 
varied in strength from 300¢. g.s. to 12,000c.g.s, The liquids 
within a groan A a a , A central opening in the 
upper pole surface was sdients 4 by means of a thin brass tube 
with a sulphide of carbon manometer and a long India-rubber 
ied 
pressure at the bounding surface of air and the magnetic or dia- 
magnetic fluids, at and at right angles to the lines of mag- 
netic force, under ergoes the same increase or decrease; and that the 
height was in some cases more tha an 32™" with magnetic fluids 
wi 
e the intensity of a magnetic field. He also shows that 
the enaeiakt tension of a magnetic fluid in contact with air is 
bait Sil altered in a strong magnetic field. The quantity 
ich iedemann terms atomic magnetism (Pogg. Ann., ¢xxVl, 
1865, eo a8 can also be calculated from Quincke’s results. _— Ber- 
itzungsberichte, Jan. 17, 1884; Phil. Mag., June, 1884, p- 
59. tet 
Production of very low oe gg —M. L, Catieret 
has discovered that formene or Marsh gas can be Susployed to 
liquefy oxygen without the eiiplayment of mechanical means for 
5 
ospheric pressure. In the state of a liquid it is extremel 
mobile, and in passing to the gaseous state Eek) tt rature 
sufficiently to immediately liquefy oxygen. hod na 
silver by a oanrent of electricity the best method of measuring 
the current in absolute measure. ne Ampére deposits < grams 
of silver per hour; a sufficient amount can therefore be obtsinet 
