.178 



Scientific Intelligence. 



passing through et Lyra and « Cassiopeia, and terminated in tlie east ex- 

 actly at the Pleiades. By tracing this course on the globe, I found that its 

 direction was E. 23° N. and W. 24° S. which coincides with a direction at 

 right angles to the magnetic meridian. At the hour above-mentioned it 

 must have been almost precisely in the zenith of the place of observation. 

 Its motion was extremely slowly south in the same direction, but not 

 nearly so rapid as the arch I observed in .January 1826, and described 

 in my paper on the phenomena of 1826-7, published in this Journal. 

 The wind was W. the breadth of the arch was small, and its brilliancy 

 great at both ends, especially the west. It became more diffused and 

 fainter as it approached the zenith, where its breadth was about 5° or 6°, 

 and it did not conceal minute stars. At the western extremity it rendered 

 stars of the third magnitude nearly invisible. By half-past ten it had dis- 

 appeared. ^ 



8. Nuiice of the Mean Temperature of Falmouth and the vicinity. — In 

 the following tables are comprised the mean monthly results of observa- 

 tions made at Huel Gorland twice a- week ; at Dolcoath three times a- week ; 

 and in the neiglibourhood of Falmouth daily. The thermometers were 

 each four feet long, and their bulbs were sunk to the depth of three feet 

 under the surface, so that the variations from day to day, and even from 

 week to week, were frequently very inconsiderable. The first was in gra- 

 nite, and the two latter in clay-slate. The station at Falmouth is estimat- 

 ed at about 120 feet, and the two others at rather more than 300 feet 

 above the level of the sea. 



Huel Gorland, Dolcoath, Falmouth. 

 1822. November, 53.° 



47.2 

 43.5 

 43.55 

 44.6 

 47.55 

 51.3 

 53.8 

 54.75 

 56.1 



Mean, 



48.99 



49.94 



50.67 



