THE SMITHSONIAN INSTITUTION. 



219 



sure upon a square foot in pounds avoirdupois at each hour of the 24. 

 The numbers are those given by Osier's self-registering anemometer. 



TABLE IX. 



MEAN DIURNAL VARIATION OF THE PRESSURE OF THE WIND AT GREENWICH. 



Maximum. 



For the purpose of comparison, and to illustrate the fact that the 

 diurnal variations of the meteorological elements follow the same gene- 

 ral law in the parts of the earth the most widely separated, the follow- 

 ing tables are given from observations made at Bombay: 



TABLE X. 



MEAN DIURNAL VARIATION OF TEMPERATURE AT BOMBAY, 1843. 



Minimum. 



Maximum. 



The nninimum temperature in this table occurs at 6 a. m., and the 

 maximum at 2 p. m. 



TABLE XI. 



MEAN DIURNAL VARIATION OF TENSION OF VAPOR AT BOMBAY, 1843. 



