~ 
280 Miscellaneous Intelligence. 
belt extended from E. 8° S., overhead to N. 25° W. bending a litle south 
n average width of about 24° and well de- 
fined. 23d, Another ~— i ee at ape: M. an arch extended 
—e 
- 
= 
ie") 
© 
a) 
a 
@ 
x 
=) 
= 
a 
me 
arches in _ Naz in these the flitting motions of the light were very 
y loth, An ill defined auroral eae 08 in the N., 18° high—sky be- 
spatle i nearly black ; 19th, slight auro 
= ly 19th, Slight aurora in the N. W.; 27th, a low auroral arch 
eN. 
Seedkks 13th, Auroral arch quite low; 2lst, slight auroral light; 
26th, ae posit light and several shooting stars 
y the foregoing notes, it will be seen that the aurora borealis was 
f very rare occurrence during the last half of the year, it having been 
observed only five times after the 19th of May, and not once in the last 
three months. During the entire year it was observed only twenty-one 
times. In on years its occurrence has been annually between thirty 
and forty tim 
. Denictiityation of the Theory of ts Pendulum Experiment ; by 
. J. L. Dace.*—Let TABL, fig. 1, be a circular table, over the 
‘iitie of which K, let 
n 
dia 
ter of the table, i it will 
a ac a 
disturbed by =y inter- pe 
fering caus 
itself has the same m motion, in addition to that by which it vibrates : 
then the relative positions of the pendulum and the table remain as 
before. The point of suspension will continue to be over the ce entre 
from time to time, has contained several excellent a 
compact, geom: metrical dem pote own, like the pithy Beis: 
many teachers ers, who For felt the need of a simple and concise 
truly, : BW 
vaca rele Penfield, Geo. 
