Journal of Meteorological Observations. 103 



column shews the degrees of temperature of the atmosphere, 

 as exhibited by the external Thermometer attached to the 

 Hygrometer ; the third, that of the dew-point; and the fourth, 

 the difference between the temperature and the dew-point, 

 or the degree of dryness actually existing as expressed by 

 the thermometric scale. The fifth column exhibits the state 

 of the weather at each period of observation. 



The right hand pages contain the extremes of temperature, 

 as well as the direction and force of the wind, and the amount 

 of rain, with a few general remarks upon the state of the 

 weather during each month, and the means deduced from the 

 three daily observations, as well as an abstract of the number 

 of days in which the wind blew from the eight chief points 

 of the compass, or approximating thereto. The first column 

 on the left, shews the maximum temperature in the shade, 

 obtained by a mercurial Thermometer, placed as stated in 

 the Report, four feet from the ground, in an open and airy 

 situation. The second is the minimum temperature, obtained 

 in the same place with a spirit Thermometer. The third 

 column is the maximum temperature in the sun's rays, ob- 

 tained by a mercurial Thermometer placed about two inches 

 from the ground ; and the fourth column is the degree of 

 terrestrial radiation, as shewn by the spirit Thermometer 

 used for that purpose ; these Thermometers being of course 

 all self-registering. 



