506 Meteorological Observations. [Nov. 



» 



llth Nov.- 



-Em. I. 



Sat. Prinsep, 



a. 



very 



good, 



8 43 57 



5 53 12 







Gordon, 



d. 



do. 





8 44 05 



5 53 20 







Logan, 



d. 



do. 





8 43 48 



5 53 03 







Barrow, (power 



70) e. 



do. 





8 44 32 



5 53 47 



17 th Nov. 



Imm. III. 



Sat. Barrow, 



c. 



do. 





9 43 



5 54 34 



18th Nov.- 



—Em. I. 



Sat. Gordon, 



d. 



very 



clear, 



10 40 01 



5 53 19 







Prinsep, 



b. 



do. 





10 39 47 



5 53 05 







Wilcox, 



c. 



do. 





10 39 50 



5 53 08 







Logan, 



d. 



do. 





10 39 43 



5 53 01 







Barrow, 



c. 



do. 





10 40 06 



5 53 24 



27th Nov.- 



-Em. I. 



Sat. Gray, 



c. 



good, 





7 5 10 



5 53 10 







Logan, 



c. 



doubtful, 



7 5 15 



5 53 32 







Barrow, 



c. 



do. 





7 5 22 



5 53 39 



VII. — Abstract of Observations of the Temperature^Pressure^and Hy- 

 grometrical state of the Air in the vicinity ofDehli. By Major Oliver. 

 The observations were made at various places within the Dehli 

 territory, not exceeding 50 miles distance from the city, and generally 

 much less. It would of course have been more satisfactory had they 

 been made at one and the same place, but I was not stationary and 

 had not always the opportunity of making my observations at the most 

 favourable hours : notwithstanding these disadvantages, I trust it will 

 be thought that the mean results are at least as consistent as could 

 reasonably be expected. 



Referring to table I, my barometer is one of Dollond's : it was 

 compared five or six years ago with the one then used in the 

 Surveyor General's office, when it stood «055 higher than the latter : 

 the reduction has been made accordingly. The mean daily range 

 during these eleven months, appears to be too little ; but on taking the 

 mean of a long series of observations made in camp, I find the mean 

 is -103. I had no observations at Giirgaon in April, but as the Baro- 

 meter in that month stands at nearly its mean height, the want of these 

 is perhaps of little consequence. It will be observed, that there is an 

 extreme difference of about 120 feet in the elevation of Gur^aon 

 above Calcutta, as deduced from the observations at the two places for 

 the several months : when it is considered that each of the results in 

 the Table is deduced from the mean of about sixty observations at 

 each place, it is evident how little dependence can be placed on the 

 results of single observations at places so far distant*. 



* The difference of the altitudes deduced from the monthly means, is just of the 

 nature which was anticipated in consequence of the annual barometrical range in- 

 creasing with the latitude ; (vide page 30 of this Journal,) for all places in India 

 north of Calcutta, the summer observations will give too high an altitude, — the 

 winter, one too low: for southern latitudes the reverse will occur. We hope to fur- 

 nish a correction for this hereafter. — Ed. 



