Twelve days later all
but two of these men were down with small-pox, and the only possible
source of infection was the hospital across the river. (_To be
continued_.)
* * * * *
SUNLIGHT COLORS.
[Footnote: Lecture delivered by Capt. W. De W. Abney, R.E., P.B.S., at
the Royal Institution, on February 25, 1887.--_Nature_.]
By Capt. W. DE W. ABNEY.
Sunlight is so intimately woven up with our physical enjoyment of life
that it is perhaps not the most uninteresting subject that can be chosen
for what is--perhaps somewhat pedantically--termed a Friday evening
"discourse." Now, no discourse ought to be be possible without a text on
which to hang one's words, and I think I found a suitable one when
walking with an artist friend from South Kensington Museum the other day.
The sun appeared like a red disk through one of those fogs which the east
wind had brought, and I happened to point it out to him. He looked, and
said, "Why is it that the sun appears so red?" Being near the railway
station, whither he was bound, I had no time to enter into the subject,
but said if he would come to the Royal Institution this evening I would
endeavor to explain the matter. I am going to redeem that promise, and to
devote at all events a portion of the time allotted to me in answering
the question why the sun appears red in a fog.
Pages:
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119