432 Scientific Intelligence. 
ordinary method of equalization, they have deduced ve pee re 
eurve exhibiting the decimal period of solar disturban 
‘They find ronrgaa bee the following epochs of maximum and 
minimum spotted area :— 
Minimum Nov. ma 1833 Minimum  April21 1856 
Maximum Dec. 21 1836 Maximum Oct. 7 1859 
Minimum Sept. 21 1843 Minimum Feb. 14 1867 
Maxim Nov. 14 1847 : 
From these dates it will be perceived that (as has hem already 
observed) the time between the minimum and maximum is always 
ess than that between the aia um and next mini 
Tt will also be noticed that the whole period is not always of 
uniform length; nevertheless, judging from what has gone before, 
they believe that ey are perhaps entitled to conclude that the 
approaching mini will not be delayed much beyond the end 
of this year. It iin also a be remarked that, in ee the three 
series, the progression from maximum to minimum is not a simple 
progression, but exhibits in each case traces of a pcaontiey max- 
final y they have examined these results for traces of the action 
of the p — Evece Sun-spots, and pursuing the method indicated 
in their preliminary researches, they derived the following table, 
as exhibiting the evidence deduced’ from all the observations be- 
tween 1832 and 1868:— 
Relative Planetary Excess or Pescieney of Spotted Area. 
Separation. Jupiter and Venus—Mars and Mercury. 
Between 0° and 30° + 881 +1675 
30 — 60 — 60 — 13 
66 a — 452 — 166d 
v0 = -196 — 579 —2355 
130°? 160 — 705 —2318 
160 | ™ S80 — 759 —1604 
130° * 310 — 893 — 481 
210 “ 240 — 752 + 547 
240 “ 270 — 263 + 431 
ere "e00 + 70 + 228 
300 ~™ S30 + 480 +1318 
330 0 +1134 + 2283 
From this table there a to be an excess of solar activity 
when either Jupiter and Pass or Mars and Mereury a together, 
and a deficiency when they are 180° see also 
that the progression is regular i met ace and 
i in the one case to what it is in the other. 
spectroscopic researches 
Sun. “Binoa the last Report he hae’ found t several other 
es besides hydrogen are occasionally to be detected apne 
of | right lines of these substances rising above 
nere, and associated with the bright lines of hydrogen, 
