Miscellaneous Intelligence. 145 
tude of magnetic changes of the same character as that which has been 
found to exist at other places, and which has been considered to be eo- 
incident with variations of the solar spots. 
The disturbances of larger amount only are noticed ; those observa- 
tions which differed by 2:5 scale divisions (18 in are at St. Helena, 
and 19 in arc at the Cape) and upwards, from the normal place, were 
separated from the others and the values of the differences taken; 
there were therefore two series of figures to be dealt with, viz: the 
number of disturbances, and the aggregate amount of disturbance. 
These were separated into disturbances of the north end of the magnet 
ered separately. 
The periodical character of disturbances at St. Helena and the Cape 
in a cycle of years is indicated so far as the limited extent of the ob- 
servations would permit; sufficient however to point to the year 1843 
as that of least disturbance at these i 
decrease from the previous years, and an increase in every succeeding 
year of observation. Though the hourly observations were discontin- 
ued before 1848, the year which Colonel Sabine has shown to be that of 
periodical maximum, (as 1843 was that of minimum magnetic activity 
at Toronto and Hobarton,) the observations now discussed are shown 
to be quite consistent with this period, and thus tend to establish it as a 
general law of magnetic phenomena. In the aggregate of each year 
the disturbances towards the west are shown to preponderate over those 
least in June at St. Helena and the Cape of Good Hope; the same 
months being those of greatest and least disturbance at Hobarton, 
whereas at Toronto, doth January and June are months of minimum 
disturbance, the maxima disturbance occurring there in April and Sep- 
tember, 
From this identity of the epoch of greatest and least disturbance,— 
at St. Helena, where the months of January and June are not those of 
opposite seasons, viewed either with respect to the sun’s extreme allti- 
The westerly disturbances were found to exceed the easterly in eve- 
Ty monih in the year at St. Helena and the Cape, which —* with 
the results deduced from the Hobarton observations, while it appears 
Szconp Serins, Vol. XVH, No. 49.—Jan,, 1854. 19 - 
