76 Mr Hardie's Outline oftJie 



3. For either the English Barometer or French metrical 

 barometer and centesimal thermometer, giving H in French 

 metres. 



« = { '^»2« + =>*(' + '') IItt ' - { '•"» + ^} (— ^ 



+ h (0.00268 + 0.002G8 cos 2 ;l + 0.00000005 h). 

 In all these three formulae, the second part may be omitted 

 in small heights, not exceeding 2000 or 3000 feet, without sen- 

 sible error, which renders this mode very ready in practical 

 cases, when Tables are not at hand, or are inconvenient in their 

 application. 



Edinburgh, 54. South Bridge, 

 September 1832. 



} 



Outline of the Geology of the Bhurtpore District. By James 

 Hardie, Esq. Bengal Medical Establishment. (Concluded 

 from p. 336 of preceding volume.) 



I HAVE, in a former communication, given you a very general 

 account of the " Indian new red sandstone formation," and I 

 took the opportunity of hinting, that the complete identity of 

 this formation with that of England, had not been demonstrated 

 in a perfectly satisfactory manner ; and I also hinted, that per- 

 haps some of the beds of the Indian series might eventually be 

 discovered to be synonimous with the " inferior new red sand- 

 stone formation,'' or red sandstone interposed between the mag- 

 nesian limestone and coal formation. The more I have thought 

 on the subject, the more I have felt disposed to believe that 

 such will prove the result. Sandstones, associated with rock- 

 salt and gypsum, do undoubtedly occur in the north-west of 

 India and elsewhere, but these minerals have not heretofore been 

 observed in connexion with the southern Gangetic series. Lime- 

 stones, containing numerous organic remains, said to be identical 

 with those of the lias, also occur in the northern and western dis- 

 tricts ; while the organic remains of the limestones of central In- 

 dia, Bundelcund, &c. are, to say the least, exceedingly obscure. 

 The latter, with their accompanying sandstones, perhaps belong 

 to a series inferior to the saliferous sandstones and conchiferous 



