136 
the moon had really any rotatory motion, but the controversy 
ceased when attention was called to the necessary distinctions 
between relative and absolute motions. 
As the same law of no rotatory motion of the satellites 
of Jupiter with respect to their primary is believed to exist, 
we are led to conclude that Jupiter is a magnetic body, and 
his satellites are diamagnetic bodies. 
March 8, 1869. 
The PRESIDENT (PROFESSOR SeLwyn, D.D.) in the Chair. 
The Meeting was held, by permission of the Museums and 
Lecture Rooms Syndicate, in the Anatomical Lecture Room, 
New Museums. 
The following new Fellows were elected : 
Rev. G. Henstow, M.A., Christ's. 
RicHarRD ©. JeBB, M.A., Trinity. 
Linnzus CumMine, M.A., Trinity. 
On the generation of clouds by actinic action, and the 
reaction of such clouds upon light. By Professor 
TyNnDALL, F.R.S. 
Professor Tyndall commenced by referring to the distinction 
drawn by Fichte between the processes used by two different 
classes of minds to arrive at clearness of religious belief, the 
logical and intuitive methods. These methods, he said, had a 
no Jess important bearing upon the observation of external 
nature. To know nature’s operations required a long and careful 
scientific training, but to see them was in the power of men of 
culture and imagination. Perhaps an image of natural processes 
placed before even persons destitute of the scientific training 
would be interesting, and might woo some of those who had 
hitherto been seers to be knowers of nature. 
