94 H. A. LENEHAN. 
No. 165 shows its position to be R.A. 9h. 31m. 13s.— 
Dec. = + 12° 25’ (1880), and its position angle and distance, 
at the epoch 1905°38, were 333° 1’ and 2’04 respectively. 
In 1878, Professor Burnham, observing in the position 
given by Herschel, saw a pair which was not identical 
with H. 165, and in the year 1902 was too faint for him 
to see. In 1901, repeating Herschel’s mistake in the 
R.A., he observed the true H.165, whilst in 1905 Professor 
Doolittle found a similar pair to H.165 in the same 
declination south and in the R.A. given in mistake by 
Herschel. 
Magnetic Storms and Sun Spots.—William J. 8. Lockyer 
M.A., Ph.D, remarks :— 
“ During the year several interesting papers have been read on 
the subject of the magnetic disturbances 1882-1903 as recorded 
at Greenwich. The relationship between sun spots and the 
occurrence of these storms is evidently not yet solved, for to 
mention simply two of the deductions arrived at— Professor 
Schuster sums up his remarks in the following words :—‘ At 
present we are only able to form more or less plausible guesses as 
regards the necessary mechanism,” while Father Cortie comes to 
much the same conclusion, that no law has been established. 
An important question relative to the above problem is what is 
the period of rotation of the sun at sun spot level, and does this 
period remain the same at sun spot minimuin and maximum 4 
Dr. Halm has shown that the spectroscopic observations at the 
level he examined exhibited different values of the velocity at 
maxima and minima for corresponding latitudes, and _ the 
differences in the velocities increase, the greater the heliographic 
latitude of the level at the solar limb. This important research, 
which has now been published more than a year and a half, 
opens up a field of inquiry of great interest.” 
Distribution of Actinic Sunlight on the northern hemi- 
sphere at summer solstice is considered, the conditions would 
reasonably be supposed to apply also to the southern hemi- 
