. 
Chemistry and Physics. 239 
mean diurnal range of the declination and horizontal force. 
From this table the curves D D, H H in the figure are plotted 
(the original plate,oneofthree = & ¢ 3392 ¢¢ Sun Spots. 
7] « 
! 
F 
( 
r the curves of declination ig )- = 
e 
g. 
= 
° 
a) 
° 
{=| 
- 
pN] 
eed 
oe 
ber | 
fer) 
oO 
$9 
o 
au 
2 
=) 
v 
| 
or 
1 
7 may 
4 
Sun-spot number, 
comparison of the three 1d d « 
sp 
onding to the Ll-year sun- |-TTT} ‘ wh Z 
ot period. =< 
Other conclusions deduced 5 = 
by Mr. Ellis are as follows : 3 : 
(1.) That the epochs of mini- 
mum and maximum magnetic : BY 4 
Ww 
tion in different periods appear | [[[TTT! 
be similar for both phe- 
mena, 
ae The occasional more [4 TTT 
den outbursts of magnetic CTSe ap 
tt 
51 
wae a ee 
ange, are sub- Ti 
— ee 
‘ © periodical varia- “Declination. — & 
a a 
Hor. Force. 
