Dewsbury.
_Polarised Light_ (Vol. viii., p. 409.).--I am unable to furnish H. C. K.
with knowledge from the fountain-head touching this phenomenon. On
referring, however, to a little work, much valued in my boyish days, I find
it thus mentioned:
"The blue light of the sky is completely polarised at an angle of
seventy-four degrees from the sun, in a plane passing through the sun's
centre."--P. 219. _Newtonian Philosophy_, by Tom Telescope: Tegg, Lond.
1838.
Surely the Herschels mention this.