APPENDIX. 



38s 



vol. ii. pp. 268, 269 ; but, so far as I can ascertain, the record of 

 their observations of the barometer and thermometer has never 

 been given to the world. 



In " Copernicus,'' vol. iii. p. 193, et seg., Mr. Ralph Copeland 

 has published a summary of the results of a series of meteoro- 

 logical observations made by him at various stations on the 

 line of railway connecting Mollendo on the Pacific coast with 

 Puno in Bolivia, near the lake of Titicaca, and also at La Paz 

 and at Tacna. Two series of observations were made at 

 Vincocaya, the summit station of the railway, 4377 metres above 

 the sea. All the other stations are either on elevated plateaux, 

 or on open slopes inclining gently towards the coast. The 

 temperatures are partly derived from numerous observations 

 and partly by taking the mean of the maxima and minima, with 

 corrections for each station, the reasons for which are assigned 

 by Mr. Copeland. In most of these I am inclined to concur, 

 but there are two from which 1 am fo:;ced to dissent. In re- 

 ducing Mr. Copeland's tables to metrical measure, I have there- 

 fore ventured to make some corrections, which do not, however, 

 much alter the results. 



I give below the heights above the sea, in metres, with the 

 corrected mean temperature for each place, and the dates for 

 each set of observations. 



Without entering into minute details, or discussing the small 

 corrections for changes in the sun's declination to be allowed 

 for latitude and for the dates of observation, we perceive that 



2 C 



