416 Scientific Intelligence. 
of record at Greenwich and Toronto. The varying pressure of the at- 
the, meteorologist recognizes in the atmosphere, of the aurora aan 
he considers may all produce changes in the lin nesop” magnetic fore 
and become more or less sensible in the records of ‘rregular viitobiel 
bos author thinks it very possible that masses of air at different temper- 
y be moved by the magnetic force of the earth, according to 
te spoiiliples of differential action made manifest in the experiments on 
cold oxygen, in which case material as well as potential mag- 
netic storms may exist. He concludes his paper by calling attention 
the atmosphere. 
Twenty-seventh Series. Atmospheric Magnetism continued, 
ing the well-known system of magnetic forces, was placed with its mag- 
netic axis parallel to a free needle ; when its position was such that a 
needle within the ring would point with the north end downward, then 
observed. When the needle can move only in one plane, there are 
four quadrants, formed (in the case of the doelikation needle) by the 
intersection of the planes of the habe equator and meridian. When 
In i 
force, according to the sores of conduction before gerd Pooa the 
author considers generally where the regions of cold which travel round 
the earth every twenty-four hours will be in the northern and. southern ~ 
hemi: and how they will grow up and diminish in extent and im= 
portance: as the sun moves north and south during the year. A 
which | s these considerations, and the result tof nape expel 
with the ring helix, to is ee of the changes of = 
oe 
