7 
336 Proceedings of the British Association. 
Ministry of the Marine, all which instruments, through the effi- 
cient intervention of M. Arago, it is understood will be placed at 
the disposal of the observer or observers who may be appointed 
to conduct the observations. ‘To complete the establishment, 
however, certain instruments, as well as registry-books, &c. are 
still requisite. ‘The Council of the Royal Society have under- 
taken to supply these from the Wollaston Donation Fund.* As 
regards the magnetic observatory at Breslau, under the diréction 
of M. Boguslawski, your committee have to report, that in order 
to secure the establishment of that station, and to place it on an 
equal footing with the rest, certain instruments, &c. required to 
be provided, for which no funds existed or could be made avail- 
able on the spot, viz. a bifilar and a vertical-force magnetometer, 
with the requisite reading telescopes, and a set of registry-books. 
* * These were supplied at the expense of the Association. * * 
A letter from M. Boguslawski, dated July 22, 1840, announces 
the safe arrival of the instruments and books in question, and 
the consequent complete state of instrumental equipment of the 
Breslau observatory, expressing at the same time, his sincere 
thanks for the assistance accorded him. By returns from the 
several stations authorized bythe British government, so lar as 
yet received, it appears, that -the observatories at the Cape and St. 
Helena might be expected to be complete and ready for the re- 
ception of the instruments in May. From Van Diemen’s Land 
no accounts have yet been received. At Toronto, Canada, where 
the greatest delays and difficulties were to be expected and have 
en experienced, the observatory was so far advanced at the 
date of Mr. Riddell’s last communication, as to leave no doubt of 
its completion in time for the regular observation of the August 
term.+ Meanwhile, in this, as at the other stations, all observa 
tions practicable under the actual circumstances of each are made 
and regularly forwarded ; and here your committee would espe- 
* An interesting view of the existing state of knowledge respecting terrestrial 
magnetism, and a detailed account of the present magnificent system of magnetic 
observations, is contained in a paper in the (London) Quarterly Review, July, 
1840, No. 131, Vol. 66.—Eps. : 
+ On the term days, which begin on the Friday preceding the last Saturday 12 
February, May, August and November, at 10k. P. M. Gottingen mean time, the 
magnetic observations are continued for twenty-four successive hours, at intervals 
of two and a half minutes. Similar observations are also made on the Wednesday 
preceding the 2st of each remaining month.—Eps. 
