108 Corrasg thence of J. Nicklés. 
a 
F 
; 
ol 
it is represented by 0-18 at the temperature of 
flect that the earth is surrounded by a mass of air equivalent 
‘to a stratum of mercury 76 centimeters in hei ht, we can 
a similar mass submitted to the incessant variations 0 
pressure and te ature, o 
e 
what is the real magnetic is fluid mass we find that itis 
equivalent to an immense shell of iron of a thickness of oth of a mil- 
imeter, covering the entire su he globe. M. Becquerel’s re — 
rul n confirmed lay* and by M. Matteucci by 
different methods, M. Plucker having reached r results by the use 
of a method of his own—a by wei atin 
and Dr. Simonin of Nancy, some general facts of the highest interest — 
anied byan almost complete absence of ozone in the air; this is 
Submilting pure oxygen to the electrical current. Ps 
e following is a new mode of pre ring it in abundance (or at 
least a similar body) capable of oxydizing silver, of decomposing iodid 
+ It will be remembered that in 1849 much was said in the medical journals of 
this land, on the relation between cholera and ozone, the absence 
lera, United States.—Eps. 
