CLIMATE. 
249 
end of twenty-three minutes, by which time 
the gust was completely oyer, I found it down 
to 59°, a change of 22°. A north-west wind 
now set in, the evening was most delightful, 
and the thermometer again rose to 65°. In 
Pennsylvania the thermometer has been known 
to vary fifty degrees in the space of twenty-six 
hours. 
The climate of the middle and southern 
states is extremely variable; the seasons of two 
succeeding years are .seldom alike; and it 
scarcely ever happens that a month passes 
over without very great vicissitudes in the 
weather taking place. Doctor Rittenhouse 
remarked, that whilst he resided in Pennsyl¬ 
vania, he discovered nightly frosts in every 
month of the year excepting July, and even in 
that month, during which the heat is always 
greater than at any other time of the year, a 
cold day or two sometimes intervene, when a 
fire is found very agreeable. 
The climate of the state of New York is 
very similar to that of Pennsylvania, excepting 
that in the northern parts of that state, border¬ 
ing upon Canada, the winters are always severe 
and long. The climate of New Jersey, Dela¬ 
ware, and the upper parts of Maryland, is also 
much the same with that of Pennsylvania; in 
the lower parts of Maryland the climate does 
ppt differ materially from that of Virginia to 
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