400 Report upon the Meteorological Observations 



frequently observed as high as 90° in the shade, and twice as 

 high as 95° between 2 and 3 P. M. At 9 P. M. it was several 

 times as high as 75°, and on no occasion was ever lower than 

 48°. Notwithstanding this heat, the wind was not due south 

 for a single day. After the 20th the wind was northerly, and 

 the nights became colder. 



In August the weather was occasionally showery and 

 cloudy, and during the month 2.03 inches of rain fell. The 

 wind was chiefly westerly. The mean degree of moisture 

 increased to .857, but on one occasion the air was noticed to 

 be as dry as .359, a state in which it is seldom found in this 

 country. This was at noon on the 9th ; the thermometer 

 at 69° in the shade, with a very slight breeze from the 

 west. The difference between the temperature in the shade 

 and under the influence of the solar rays, was, on the 20th 

 at noon 40°, the shade being 70°, and the sun 110°. The 

 greatest degree of terrestrial radiation was indicated by the 

 radiating thermometer to be 41° on the first day on which 

 the instrument was used. 



In September the weather became more unsettled, 12 days 

 during the month being more or less rainy. The amount 

 of rain was however inconsiderable, being only 2.31 inches. 

 The early part of the month was hot and very fine ; that 

 part during which the rain fell was very sultry, the thermo- 

 meter being usually about 70° in the shade at noon, and ten 

 or fifteen degrees higher in the sun. The mean degree of 

 moisture was .863, which was a little higher upon the whole 

 than in August, but no day was found to be drier than .537, 

 which was a material increase of humidity beyond that of 

 August. The highest degree of heat which the thermometer 



