52 
PHYSICAL AND MATHEMATICAL SECTION. 
October 10th, 1867. 
Joseph Baxendell, F.R.A.S., Vice-President of the Section, 
in the Chair. 
“ On Solar Radiation/’ by J. Baxendell, KRAS. 
[This paper was afterwards read at the Ordinary Meeting 
of the Society, held November 26th, 1867, see page 36.] 
November 7th, 1867. 
Robert Worthington, F.R.A.S., President of the Section, 
in the Chair. 
“A Comparison of Solar Radiation on the Grass, and at 
Six feet from the Ground,” by Thomas Mackereth, F.R.A.S. 
[This paper was afterwards read at the Ordinary Meeting 
of the Society, held November 26th, 1867, see page 50.] 
“Note on the Colour of the Moon during Eclipses,” by 
A. Brothers, F.R.A.S. 
On the night of October 4th, 1865, there was a partial 
eclipse of the moon, when about one-third of the disc was 
obscured. My time and attention on this occasion were 
chiefly directed to some Photographic experiments, and it 
will be remembered I then obtained pictures of the eclipse 
at short intervals, from the commencement to the end. 
At about the greatest phase I looked at the moon through 
the telescope with an eye piece of low power, for the 
purpose of noticing whether the eclipsed portion showed 
colour, and at once saw that the part of the moon most 
deeply within the shadow was of a decided copper colour, 
such as I had seen some years previously during a total 
eclipse of the moon. 
The eclipse which occurred on the night of the 13th 
September last, was rather more favorable for detecting 
the presence of colour, as seven-tenths of the moon were 
covered by the earth’s shadow ; the weather being clear 
many persons have recorded their observations, and as the 
