358 Observations made on a Botanical Excursion. [Oct. 



The mean height of the granite table-land from Taldanga to Dunwah 

 pass, and of Parus Nath, its culminant point, above the plains of Behar 

 (below the Dunwah pass) and the sea. 



The mean height of the plains of Behar from the Dunwah pass to 

 the Soane, and absolute height of pass. 



The fall of the Soane between Kemch (above Bidjegurh) and Dearee. 



The altitude of Rotas Palace, i. e. of the Kymaon range above 

 Akbarpore. 



The altitude of the Ghaton pass in the Kymaon at Roump, and 

 mean altitudes of the Table-land extending thence to the Bind hills at 

 Mirzapore. 



Altitude of the plains at Mirzapore. Fall of the Ganges between 

 Mirzapore and Bhaugulpore (approximately). 



Mean temperature, Dew-point, force of vapors. Weight of vapor 

 in a cubic inch of atmosphere, and rate of evaporation as calculated 

 from the wet-bulb thermometer on the plains of Behar, and the afore- 

 said table-land. 



Mean amount of nocturnal radiation from the exposed thermometer, 

 from soil and from grass, at the aforesaid place. 



The barometrical elevations have been computed with great care,* 

 but so materially does the fluctuation of the mercurial column in Behar, 

 upper Bengal, and the other tracts of country visited, differ from those 

 at Calcuttaf that they give but approximate heights. 



It has been asserted by a most excellent Meteorologist (Jas. Prinsep) 

 and one more practically familiar with the climate of India than any 

 other ; that a few observations made at any part of N. India are so 

 comparable with those at Calcutta, that from such the difference of 

 elevation of the latter and any other station may be deduced with 

 considerable accuracy. This no doubt holds true for the more level 



* I cannot sufficiently express my obligation to my friends, J. and C. Muller, Esqs. 

 for the assistance they have afforded me, in these and other computations whose results 

 are detailed in this paper. Many of the observations were reduced by these gentle- 

 men and the elevations determined, and all of them revised from various formulae, 

 some of them very complicated. What errors therefore are to be attached to the 

 results, may be safely laid to the observer's charge, not to the Instrument, and still 

 less to the computations. 



t In Calcutta, in Feb. and March the sunrise observation is generally higher than 

 the 9 p. m, of the previous night — on the hills and plains traversed the opposite was 

 almost always true. 



