Nov. 8, 1858.] 



AND ASCENT OF DEMAVEND. 



17 



observation we worked out according to the tables of heights and 

 corrections furnished with the instruments. We, on most occasions, 

 took the observations with more than one thermometer, but those 

 here mentioned were shown by Casella's thermometer, No. 161, as 

 registered and rectified at the Koyal Observatory of Kew. 



The instruments not allowing of any greater height being taken 

 by their means, we were reduced to the necessity of boiling a 

 common thermometer, to ascertain the boiling point at the summit. 

 The accuracy of our observation may however be relied upon, for 

 after carefully comparing this common thermometer with that 

 furnished by Casella, we could distinguish no observable difference. 

 Apart from this, we may observe, that from the point where the other 

 thermometer was no longer available to the top we were nearly 3 

 hours walking, without stopping anywhere beyond what was neces- 

 sary for resting, during which time we could have scarcely mounted 

 less than 3000 feet. 



The observation was taken in the cave 100 feet from the summit. 

 The boiling of the thermometer was complete and satisfactory, we 

 having provided ourselves with charcoal to be prepared in case 

 of need. 



In conclusion, we may mention that we do not pretend to any 

 scientific acquirements whatever. The above is only a statement of 

 what we saw and observed, which may however prove somewhat 

 interesting from the fact that nearly all the country we have explored 

 has been hitherto almost, if not altogether, unknown to European 

 travellers. 



Several specimens of sulphur from the summit of Demavend, and 

 a few specimens of mineral found in the Valley of Rudbar, are 

 transmitted with this paper, together with a map giving an outline 

 of the route we followed. 



The President. — Whatever comments may be made upon this paper, and 

 upon the method employed to determine the height of the mountain Dema- 

 vend, you will all agree with me that the greatest possible credit is due to the 

 two gentlemen attached to Her Majesty's Mission in Peisia, who have em- 

 ployed themselves so energetically in the furtherance of geographical science. 

 Mr. Murray gives his young friends every credit for what they have done, and 



VOL. III. C 



