t 



\ 



66 Dr. Holyoke's Estimate of the Excess of Heat and Cold 



Europe. To which are added my own observations of the 



greatest heat and cold, &c. made at Salem in Massachusetts. 



By this table it appears, that of the twenty European cities, 

 mentioned in it, the thermometer was' highest at Wartz- 

 burg,^ in the circle of Franconia, viz. 102°. 4, which falls 

 short of our greatest heat above 3 degrees. The greatest 



degree of cold happened at Sagan, a city in the western bor- 

 ders of Silesia. There the mercury in the thennometer sank 

 to — 21°. 32, whicli exceeds our greatest cold at Salem by 

 10°. 3; but is just as low, as we were informed by the pub- 

 lick prints at the time, though I know not upon wdiat au- 

 thority, that the thermometer fell at Hartford in Connecti- 

 cut, and at New York, in the month of January 1786. But 

 what is most to our purpose, the mean of the greatest heat 

 in all those places, taken collectively, for the period noted 

 in the third column of the table, amounted to no more than 

 + 86^ 41, which is more than 10° short of the mean of 

 our greatest heat at Salem: and the mean of the greatest 

 cold in these twenty cities, amounted to -f 3°'. 31, which is 

 short of the mean of our greatest cold upwards of 5 degrees. 



But in order to determine the difference between our heat 

 and cold, and the European, in the same latitude, we must 

 compare with those cities, which are situated in latitiKies 

 nearest our own, viz. Padua, Marseilles, and Rome. We 

 find by the table, that the mean of their greatest heat falls 

 short of our's 5^62, 7°. 42, and 11°. 59, respective! v. We 



also find the mea a of the greatest cold of 



pectwely, 

 these three 



by 19°. 41, 29°. 92, and 35°. 88, respectively 



Further, the mean of the greatest heat of 



these thr 



• . • 



taken 



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