90 JOURNAL OF PROCEEDINGS. 
JHE, SUN, 
Synopsis of an Address Delivered by Mr. Arthur Harvey, F.R. 
S.C., Honorary President and Director of La Instituto 
Solar Internacional, Monte Video, Uruguay, be- 
_ fore the Astronomical Section of the Ham- 
ilton Scientific Association. 
80 Crescent Road, 
Toronto, October Ist, 1903. 
DEAR Mr. MARSH: 
The address I delivered to the Hamilton Astronomical 
Society was not written. It was designed to bring to the so- 
ciety’s notice the new views which have been formed in recent 
years as to the constitution of that mighty orb, and with the aid 
of your officers I was privileged to show a number of photo- 
graphs of his spots, prominences and corona. I only touched 
briefly on my own investigations, which relate chiefly to the con- 
nection between sun spottedness and terrestrial magnetic 
storms, also to solar cartography, and I showed some of the 
maps made from Swiss and Italian records, which I have been 
drawing for many consecutive years, and which indicate how 
the zones of solar excitement move to or from the equator as 
the spot period progresses from minimum to maximum and 
back again, in a regular pulsation averaging a little more than 
eleven years. 
Almost every great spot is associated with a magnetic dis- 
turbance, shown by violent oscillations of the compass, though, 
as the spot is only the effect of some change in solar conditions, 
it is incorrect to say the spot causes the disturbance, and wrong 
to expect a precise concordance in time. The magnetic shock 
is usually felt when the spot is near centrality on the disc. That 
the connection is clearer than has usually been admitted by the 
