OBSERVATIONS. 



^ 



I obtain the daily mean temperature from the 

 extremes indicated by a pair of Rutherford's 

 horizontal self-registering thermometers, placed 

 15 feet above the ground, out of the window of 

 a room on the second floor, having a northern 

 aspect. The situation is airy and out of the 

 direct influence of the sun. The mean annual 

 temperature, which, on the average of the eight 

 years' observations, is 48®. 8, in all probability 

 is nearly correct, as it accords exactly with that 

 deduced from the following series of observations 

 on the temperature of spring-water. 



