82 Measurement of the Pico Ruivo, by Capt. Sabine. 



Observations made at Madeira, January 13, 1822, to deter- 

 mine the elevation of several Stations in the ascent to the Pico 

 Ruivo. 



The results have been deduced in the manner explained in 

 Mr. Daniell's paper, " On the Corrections to be applied in Ba- 

 rometric Measuration," published in No. XXV. of the Quar- 

 terly Journal of the Royal Institution ; the barometric differences 

 have^been augmented by ^"^^th, as 68 inches of mercury in the 

 tube are equivalent to one inch in the cistern ; and g^ of the 

 approximate result has been added, as a correction due to the 

 variation in density of the atmosphere, in the latitude of 

 Madeira." 



Art. XII. Analysis of a New Sulphur Spring at Har- 

 rogate, by William West, Esq. 



[Communicated by the Author.] 

 An exact acquaintance with the composition of the water of 

 mineral springs is, in many respects, highly important ; with- 

 out it we can scarcely derive the full benefit from their medi- 

 cinal employment; it throws light on geology, and on the 

 chemistry of nature, and may hereafter furnish us with hints 

 for the improvement of various processes in the Arts. 



