114 Meteorology of Bombay, by Colonel Sabhie, [No. 31 



ptenomena are clearly analogous to those which have been shewn to pre- 

 sent themselves at Toronto, Prague, and Greenwich; viz. a correspon- 

 dence of the maximum of vapour-pressure and a minimum of gaseous 

 pressure with the maximum of temperature; and of the minimum of va- 

 pour-pressure and maximum of gaseous pressure with the minimum of 

 temperature ; and a progressive march of the three variations from the 

 minimum to the maximum, and back to the minimum again. The epochs, 

 or turning points, of the respective phenomena are not in every case 

 strictly identical ; but their connexion, which is the subject immediately 

 before us, is most obvious. 



We have thus a further illustration of the universality of the principle 

 of the dependence of the regular periodical variations, annual as well as 

 diurnal, of the pressure of the dry air and of the vapour on those of the 

 temperature. 





o 



a> 









Monthly Means 



greater 





u 



O 



u 



o 





(+ or 



Less (— ) 



tLan the 





B 



ci 





£ . 



% 





Annual Means. 



1843. 



u 



O 



3 s 



■ 2 



a 



| 











Temp 



o 00 



p< 



ej 

 > 



Gaseo 



si 



Bare 



m 



Tempe- 

 rature. 



Vapour 

 Pres- 

 sure. 



Gaseous 

 Pres- 

 sure. 





Deg. 



Deg. 



Inch. 



Inch. 





Deg. 



Inch. 



Inch. 



January 



76-4* 



0*578* 



29-352 



29-930 



67 



-4-7 



—0202 



+0-323 



February 



77-7 



0-648 



29-246 



29-894 



71 



—3-4 



—0-132 



4-0-223 



March 



797 



0-710 



29-128 



29-838 



74 



—1-4 



—0-070 



+0*105 



April 



84-2 



0-853 



28-961 



29-814 



76 



+3-1 



+0-073 



—0-062 





85- 9f 



0-921 



28-743 



29-664 



78 



+4-8 



+0-141 



—0-280 



June 



85-4 



0-935f 



28-718* 



29-653 



80 



+4-3 



+0-155 



—0-305 



July 



82-1 



0-896 



28-737 



29-633* 



85 



+10 



+0-116 



—0-286 



August 



81-2 



0-859 



28-869 



29-728 



84 



+0-1 



+0-079 



—0-154 



September 



81-1 



0-859 



28-920 



29 779 



84 



00 



+0-079 



-0-103 



October 



82-2 



0-819 



29-026 



29-845 



78 



+1-1 



+0-039 



+0-033 



November . . 



80-5 



0-675 



29-213 



29-888 



67 



-0-6 



—0-105 



+0-190 



December 



76-6 



0-592 



29.368f 



29-960f 



67 



—4-5 



—0-188 



+0-345 



Mean. . . . 



81.1 



0.780 



29.023 



29- 803 



76 



1 1 



The humidity exhibits also a single progression ; but may, perhaps, be 

 rather characterized as evidencing a very dry season from November to 

 February, and a very humid one from June to September, the latter sea- 

 son being that of the rains. 



The average degree of humidity in the year is very slightly lower than 

 either at Toronto or at Greenwich, but is still closely approaching to a 

 value expressing the pressure of three-fourths of the quantity of vapour 

 required for saturation. 



The mean gaseous pressure in 1843, derived from the two-hourly ob- 



Signifies 'minimum 



t Signifies ' maximum 



