1844.] Meteorology of Bombay, by Colonel Sabine, <§•(?. 107 



the amount of the increments of temperature corresponding to given in- 

 tervals of time ; and 2d, a lateral influx of air at the lower parts of the 

 lumn of proportionate velocity, constituting a diurnal variation in the 

 force of the wind at the place of observation, which should also correspond 

 with the variations of the temperature in the epochs of its maximum and 

 minimum and intermediate gradation of strength. The anemometrical 

 observations at Toronto were shewn to be in agreement with the view 

 which had been then taken, confirming the existence of a diurnal varia- 

 tion in the force of the wind, corresponding in all respects with the va- 

 riation of the temperature. 



Admitting the explanation thus offered to be satisfactory in regard to 

 the diurnal variations, it was obvious that the correspondence of the an- 

 cual variations of the temperature and pressures might receive an analo- 

 gous explanation. 



A comparison of the results of the observations at Toronto with those 

 of the' observations of M. Kriel at Prague in Bohemia, shewed that the 

 characteristic features of the periodical variations at Toronto were not 

 peculiar to that locality ; but might rather be considered as belonging to 

 a station situate in the temperate zone, and in the interior of a continent. 

 The annual and diurnal variations at Prague were also single progressions, 

 and the same correspondence was observable between the variations of 

 the temperature and of the gaseous pressure. 



The publication of the volume of magnetical and meteorological ob= 

 servations made at Greenwich in 1842, which took place shortly after the 

 meeting of the Association at York, enabled me to add a postscript to 

 the printed statement of my communication in the annual volume of the 

 Association Reports, shewing the correspondence of the results at Green» 

 wich with the relations which had been found to exist in the periodical 

 march of the phenomena at Toronto and at Prague. 



From the concurrence of these three stations, it was obvious that con- 

 siderable insight had been obtained into the laws which regulate the 

 periodical variations in the temperate zone ; and into the sequence of 

 natural causes and effects, in accordance with which the annual and 

 diurnal fluctuations of the elastic forces of air and vapour at the surface 

 of the earth depend on the variations of temperature : and from these 

 premises it was inferred, that the normal state of the diurnal variations 

 of the pressures of the air and vapour, and of the force of the wind in the 

 temperate zone, might be that of a single progression with one maximum 



