PROVISIONAL REPORTS, AND NOTICES. A27 
of eighteen, so as to subdivide each magnitude into three. The 
final assignment of these magnitudes, resting on the collation 
and inter-comparison of an extensive series of observations 
made for that express purpose with the naked eye, occasionally 
assisted by a common opera-glass, has been a work of much 
time and labour, and is not yet quite completed. Nor till this 
is accomplished, can any further progress be made in the re- 
arrangement of the southern constellations, which, at present, 
are in a state of great confusion. 
A small part only of the grant of 50/., devoted by the Asso- 
ciation to this object, has been expended; but the whole will, 
no doubt, be required ; and your Committee, therefore, recom- 
mend its continuance. 
Signed, on the part of the Committee, 
| J. F. W. Herscuet. 
Report of a Committee for the reduction of Lacaille’s Stars in 
the Celum Australe Stelliferum. 
Tue reductions of all the stars in Lacaille’s Celum Australe 
Stelliferum are finished, and Mr. Henderson’s assistant is at 
present arranging the results in the form of a catalogue, which, 
however, could not be completed in time for this meeting. The 
completed portion, so far as finished, has been transmitted to 
Mr. Baily, to be used in the construction of the new catalogue of 
the Astronomical Society. No money has been spent during 
ce year; but, of course, a renewal of the grant will be desira- 
ble. 
_ Signed, for the Committee, J. F. W. HerscueEt. 
Report of the Committee, consisting of Sir J. Herscurt, Pro- 
fessor Wuewe ., Professor Peacock, Professor Luoyp, and 
Major Sasine, appointed to superintend the scientific co- 
operation of the Association in the Researches relative to 
Terrestrial Magnetism. 
In consequence of the measures adopted as detailed in the last 
report of this Committee, a very extensive system of magnetical 
corresponding observations has been organized, embracing be- 
tween thirty and forty stations in various and remote parts of 
the globe, provided with magnetometers, and every requisite 
instrument, and with observers, carefully selected, and compe- 
tent to carry out at most, if not in all the stations, a complete 
series of two hourly observations, day and night, during the 
whole period of their remaining in activity, together with 
monthly term-observations, at intervals of two minutes and a 
