70 P, E. Chase on Brewster's Neutral Point. 
An extensive series of comparisons* seems to warrant the 
following inferences, all of which are confirmed by other con 
siderations. 
1, Taking into view the entire land surface of the globe and | 
the entire range of the year, the direct heat of the sun and the 
induced aerial currents appear to be about equally instrumental — 
re : 
in determining fluctuations of temperature. 
e influence of the winds is most marked in the Northern : 
and Western hemispheres; that of solar obliquity, in the Sou 
ern and Eastern hemispheres. 
3. Where the sun’s rays are least intense (as in the Polar Re 
gions) and where the winds are most variable, the ratios exhibit 
the nearest parallelism to the increments of arc; but where the 
winds are most uniform (in and near the region of monsoons), 
they correspond more closely with the sinal increments. 
The general changes of temperature at midwinter, and at 
the equinoctial seasons (when the sun’s declination is changing 
most rapidly), are most dependent upon the local solar heat; the 
miceanimer changes are more subject to the influence of the 
winds. 
shown in the monthly temperature change at midsummer, which 
nds almost precisely with the change of are. 
2. On Brewster's Neutral Point. 
f Proc. Amer. Ph. Soe, ol £; ths Jouaa, vol. ali, pp. 111, 112. 
baal 
