APPLICATION OF MATHEMATICS IN METEOROLOGY 225 
simultaneously in the terrestrial magnetic field, and in the 
pressure and temperature variations, and hence in the cir¬ 
culation of the atmosphere generally. It is quite likely that 
we shall find in this short cycle more evidence of synchronism 
between solar and terrestrial events than in any other period 
that has been examined. 
In conclusion, we may observe that profound mathematical 
analysis does not guarantee that the simple law inherent in 
the physical conditions observed has been secured. There 
are enough failures of that kind to make one suspicious, be¬ 
cause it often happens that the mathematical symbolic lan¬ 
guage of the equations obscures the implied thought, which 
is in itself simple, such as might first be brought out by 
graphical methods. Also, it is evident that negative results 
have very inferior weight when they proceed from intricate 
discussions, if the observations naturally bear another sig¬ 
nification, for the unsuspected secrets of nature still contain 
surprises to man’s inquiring reason. 
