Notice relative to Captain Ross’s Discoveries, &c. 285 
‘and comprehensive a work on the organization and natural 
history of the Planariz, as Ehrenberg has given us on the In- 
fusoria. (From the Archiv fiir Naturgeschichte, 1841.) 
Notice of the Magnetometric, Geographical, Hydrographical, 
and Geological Observations and Discoveries made by the Ex- 
pedition under the command of Captain James Ross, R.N., 
F.R.S. being copy of Extracts from a Despatch addressed 
to the Secretary of the Admiralty.—With a Chart on Plate 
iy. 
I nave the honour to acquaint you with the arrival of 
Her Majesty’s ship under my command, and the Terror, under 
my orders, this afternoon at this port. 
I have further to report to you, for the information of my 
Lords Commissioners of the Admiralty, that, in accordance 
with the intentions expressed in my despatch to you, dated 
from Hobart Town on the 11th of November last, I proceeded 
to Auckland Islands, and satisfactorily accomplished a complete 
series of magnetometric observations on the important term- 
day of November last. 
- Under all the circumstances, it appeared to me, that it 
would conduce more to the advancement of that branch of 
science for which the expedition has been more expressly sent 
forth, as well as for the extension of our geographical know- 
ledge of the Antarctic Regions, to endeavour to penetrate to the 
southward, or about the 170th degree of east longitude, by which 
the isodynamic oval, and the point exactly between the two foci 
of greater magnetic intensity, might be passed over and deter- 
mined, and directly between the tracks of the Russian navi- 
gator Bellinghausen, and our own Captain James Cook ; and 
after entering the Antarctic Circle, to steer S.W. towards the 
Pole, rather than attempt to approach it directly from the 
north, on the unsuccessful footsteps of my predecessors. 
Accordingly, on leaving Auckland Islands on the 12th De- 
cember, we proceeded to the southward, touching for a few 
days at Campbell Island for magnetic purposes ; and, after 
passingamong many icebergstothe southward of 63° latitude, we 
VOL. XXXII,——-NO. LXLY. APRIL 1842. U 
