386 Dr BREWSTER on the Register of the Thermometer kept 



and 196', as one degree of temperature on the projection is equal 

 to one hour. The abscissas which represent the temperature 



were reconverted into degrees. 



TABLE, shewing the Mean Annual Hourly Temperature for 1824 and 1825, as ob- 

 served, and calculated on the supposition of these being the abscisses of Parabolas > 



Difference. 



0.000 

 + 0.075 

 + 0.039 

 + 0.003 



0.024 



0.113 



0.186 



0.138 



0.016 

 0.000 



0.098 



0.244 



0.184 



0.082 

 0.000 



+ 0.079 

 4-0.019 

 0.124 



0.008 

 0.036 



0.000 

 + 0.183 

 + 0.219 

 + 0.250 

 + 0.229 

 + 0.159 



0.000 



The numbers in column 3. were calculated by the following 

 formulae. From the property of the parabola, we have 



