of Vesuvius, and the New Coriejormed in 1822 71 



p. M. B. A. D. 



Inch. 



2 40 Three feet below the old Palo sum- 



mit of Vesuvius, - 26.198 16°. 8 13°.3 



3 15 Do. do. do. 26.190 16 .8*13 . 



3 35 Do. do. do. 26.187 15 .8 12 .8 



4 45 Do. do. do. 26.175 13 . 11 .5 



5 55 Hermitage of St Salvadore on Ve- 



suvius, - - 28.153 17 . 16 .2 



9 30 Naples, at my house, twenty-one 



feet above the sea, - 30.192 18 .8 16 .5 



10 30 Naples, do. do. 30.191 18 .5 16 . 



11 45 Naples, do. do. 30.193 18 . 

 Daniel's hygrometer observed at Naples at 8 h. 30 m. a. m. 



gave temperature of air = 62.8. Dew-point = 50. 



Sympiezometer and Thermometer observed at Naples." 



h. m. h m. h. rn. h. m. h. m. h. m. 



Hour, - 7 a.m. 8 30 9 25 11 6 5 p. m. 10 30 



Sympiezometer, 30.34 30.36 30.38 30.36 30-34 30.35 



Thermometer, 62.8 64. 68. 68. 61. 



When I was formerly at Naples in 1817, what I call the 

 Old Palo Summit was the most elevated part of the great cone 

 of Vesuvius, upon which a post had been erected, from whence 

 it derived its name of Palo. Upon my return in 1822, I 

 found this summit unchanged, and the pile of stones in 

 which the post had been planted remained as I had seen it in 

 1817. But it was no longer the highest part of the moun- 

 tain, the late eruptions having raised a cone of greater height 

 by its side. As the Palo, however, appeared less liable to 

 change than any other part of the summit of the great cone, 

 and also because the soil there was cool, and the situation con- 

 venient, I selected it for my upper station, thinking, that, if 

 the elevation of the Palo summit above the sea was accurately 

 known, we should have obtained a fixed point, to which the 

 frequent changes in its neighbourhood could easily be re- 

 ferred. 



The summit of the new cone, the height of which above 



* The temperature of the mercury is uncertain in this observation. 



