Correspondence* 



453 



January, . 

 February, . 

 March, ... 

 April, . , . 



May, 



June, 



July, 



August, . 



September, 



October, 



November, 



December,, 



Mean pressure for the year. 



Barometer at 32° Fahrenheit. 



Max. 



Min. 



Mean. 



Range. 



Inches. 

 29.5027 



In. 



29.2379 



In. 

 29.2702 



In. 

 .265 



4572 



2032 



3302 



.254 



3380 



0920 



2150 



.246 



2860 



0350 



1625 



.251 



2106 



28.9766 



1872 



.234 



0745 



8185 



28.9465 



.256 



0407 



8737 



9572 



.167 



1200 



8070 



9635 



.213 



1508 



9008 



29.0258 



.250 



3406 



29.0626 



2016 



.278 



4660 



1770 



3210 



289 



4600 



2780 



3690 



.182 



Inches. 

 29.1624 



27^^ March, 1843. 



J. W. MASTERS, 

 Superintendent South Division. 



Extract of a Letter from Charles Lyell, Esq. F. R. S. dated 

 London, May 10, 1843.* 



" Even such comparatively small territories as Newfoundland 

 and Canada, as well as 18 of the states of North America, have either 

 accomplished, or have actually in progress, such surveys, directed 

 as you suggest by scientific geologists, with powers, in most cases, 

 to employ as assistants men of practical knowledge in the respective 

 regions. These different Governments are all well convinced of the 

 economical advantage which they have derived from the surveys, in 

 checking absurd and costly enterprises, and giving a good direction 

 to mining speculations ; pointing out the nearest locahties of lime- 



* This extract from Mr. Lyell's letter is here given, to redeem the promise 

 made in the concluding paragraph p. 617, vol, 3, of this Journal. We reserve 

 our further remarks on the subject to a future occasion.— Eds. Calcutta Journal 

 Natural History. 



