38 
Mr. O'Donovan. It is, however, more perfect; as many 
chasms caused by stains and other injuries have been sup- 
plied from abstracts of the work made by the compiler him- 
self, and many corrections and much additional matter found 
in those abstracts have been inserted. The Academy’s 
transcript may therefore be considered the only perfect copy 
of the work now existing. 
Professor Lloyd read a note on the Aurora Borealis of 
the 18th inst., of which the following is an extract :— 
** At a quarter past ten o'clock, on the night of the 18th 
inst., my attention was called to a remarkable ruddy ap- 
pearance in the eastern part of the sky, which, at first view, 
- seemed to arise from the reflexion of a fire. Ona more at- 
tentive examination, however, it was soon evident that the 
appearance was purely meteoric. It was, in fact, an auroral 
phenomenon, though of a very peculiar kind. 
“Tt was bright moonlight, and Mars had just appeared 
after his occultation by the moon. The sky was entirely 
without clouds ; but the northern, eastern, and western seg- 
ments were covered with a curtain of diffused Aurora, re- 
sembling a luminous vapour. This curtain was lifted from 
the horizon on the east and west, and exhibited a deep 
blue sky. But the distinguishing appearance was, that 
large masses of this light, especially towards the east and 
north-east, were of a blood-red colour, which presented a 
vivid contrast to the blue of the sky beneath. A large 
patch of this red light, about 40° from the horizon to the 
eastward, was the most remarkable. It continued distinctly 
visible for upwards of half an hour; and its motion was so 
rapid that in this time it had advanced from about due east 
to a point nearly south-east. 
There was a mass of white streamers to the north, which 
reached nearly to the zenith, and pointed somewhere be- 
tween the magnetic and due north. At half past ten o'clock, 
