ATMOSPHEROLOGY.-^TEMPERATURE. 307 



From this table we find, that as the temperature 

 decreases, the range of the thermometer increases ; 

 hence it is probable, that in the winter months, the 

 range is nearly, if not fully, double of what it is in 

 summer. 



That tendency to equalization, which has been ob- 

 served to hold very generally in the varying appear- 

 ances and effects of meteorological phenomena, de- 

 rives a beautiful illustration from the investigation 

 of the extremes of temperature and pressure of the 

 atmosphere, as indicated by the range of the baro- 

 meter and thermometer. From a great number of 

 registers of temperature which I have had occasion 

 to examine, I am enabled to suggest the following 

 general inferences. 



1st, That in a period of several years, the mean 

 of the highest and lowest temperature observed in 

 the course of each year, agrees with the mean tem- 

 perature of the place, generally to the fraction of a 

 degree. 



Thus, from the twenty years register kept at the 

 Royal Society's apartments, between 1795 and 

 1814, the sum of the highest temperature ob- 

 served each year is 1628"', and of the lowest 

 372° 5, the amount of which, 2000.5, divided 

 by 40, the number of observations, gives 50.01 

 for the mean of the whole, which differs only 

 0.39 of a degree from the mean temperature. 



