Astronomy. AST 
the whole of the northern hemisphere, and that it was the excep- 
tional community of proper motion in Taurus which had led him 
to form his well-known theory respecting a central sun. It was 
only when I was reminded that he had in fact examined the = 
proper motions in the neighborhood of Taurus alone, having 
led by independent considerations = Piagee that neighborhood i 
that within which a central s be looked for, that I was 
encouraged to map Pre all the biped proper motions. To 
_ my surprise I found that in Gemini, Cancer, and Leo, a community 
Ree : : 
was to be recognized ; and further, that though in other — 
as I had os aa atta motions belongin g to different depths in 
ce intermixed, it was yet possible to trace out laws of 
Seisiiesina dione the existence of drifting star-groups in these 
directions 
I lay very little stress on the indications which have led me to 
name the great double cluster in Perseus as more likely to be an 
important center of motion than the Pleiades. But it is worthy 
of mention that Midler required a star on the Milky Way as the 
center of the galaxy, and Alecyone does not Jie on the Milky Wa 
he required his center to lie ninety degrees from the apex of t e 
solar motion, and Alcyone does mot lie ninety degrees from the 
mean of the last determinations of that point. The great cluster 
in Perseus fulfills pore conditions in the most ee manner. 
n 
bate It is videad of notice that Midler, having been led by 
for trac of a community of ore eae founded on the drift 
he sens found in Taurus 
(the lucida of the egeee c is the common center around whic 
But i ess Be the community of 
b ted out, of a ree hears which may be 
: es ie heave ns. In Ge mini and Cancer 
mo 
drift in Taurus being towards ya Patty 
Leo, there is also a a ll-marked adrift, in this case pes rd Cancer. 
icular instances of star-drift are not the less remark- 
=. that the stars are oatpt almost ss in the direetion due 
to the proper motion which has been assigned to the sun, because 
