46 



The instrument has always been thus coincident since 

 the writer received it in December 1848 from Messrs. 

 Watkins and Hill. 



The next series of observations, showing the portabi- 

 lity of the Aneroid for measuring heights, and also its 

 convenience as a meteorological barometer, were taken 

 during an excursion into Wales in the summer of 1848. 



Llangollen is assumed to be about 200 feet higher 

 than the Estuary of the Dee near Chester. 



