SOLAR HALOS, 635 
RECORDS DEDUCED FROM AVERAGES OF DAILY OBSERVATIONS. 
ne 
Dec. 20th Jan. Ist Jan. 10th 
to Jan. Ist. to 10th, to 20th. Mean. 
TEMPERATURE. ac) E Teh Z ee | ese 
Vireo yesptetna gue ect iors Sar bac tacts . : 9.4 4.6 
Nesey Ay RNAS OO ine tee 19.7 245 30.8 25.C 
Mean of Max and Min..... 11.6 12.7 20.4 14.9 
IRE HTS eG LRU Giiaa Beir omens 151 23.7 21.4 20.1 
Tis Ty eA oe bate eae aR ane 6.6 48 14.5 8.6 
D2 re). Gans US ull aye NCR Re 17.3 13.7 23.9 20.0 
(ja, Jats WEG ae Ma aE SR ee eee 1.1 11.9 19.0 14.0 
TLE Sa Beene None e a aa 11.5 11.8 19.1 14.1 
Ret. Humipity. 
Of Bis Welgllig Mabe cece tO HOI On Om ISIOnIE ae ORIACOSIMMRI Tiny ye iceesse ct) Li aU I oan Tene De a 
RW. Bs 5 5 619 00 6 050-0 6 OP TAMIR SMR yeti fesseeet re IE MO MTN St al nat re eee 
G) Fata Le FC 0.77 Bae ate oe 
Micanien cance ulcapenlcmeueis hatmenveies OE ACR iamemn me | 4 usstece gil UNSC Wats Ue espn he toe tal a 
PRESSURE, sea-level, 32° F. 
Teg nTAG aielieltte rene Une e 30.4 30.2 30.1 30.2 
A Fa). fabs Nis NSU ey CaS RRR eS 30.3 30.2 30.1 30.2 
Ol Tower tee aeayotriglicieteed vat tay oy ees 30 3 30.2 30.1 30.2 
Vike aya eeue ee eur veel 30.3 30.2 30.1 30.2 
WIND. 
Milestiraveled) 4 0s + oe. 3,014 | 2,824 8, 490 | 9,328 
RAINFALL. 
Inches ain ye: sos | 0.03 | 0.01 | 0.06 | 1.00 
SOLAR HALOS. 
BY PROF. S. A. MAXWELL. 
On the zg9th of last month, at eight o’clock in the morning, a most beautiful 
solar halo was observed from this locality. The mercury at the time indicated 
—12°, and the air was filled with particles of frost. The halo consisted of: First, 
a circle, 45 degrees in diameter, of white light, the sun being in the center; sec- 
ond, another circle of white light, parallel with the horizon, at the same altitude 
as the sun, and at right angles to the first circle; third, an iridescent arc of 
perhaps go degrees, belonging to a circle of 45 degrees diameter, and having the 
zenith for its center ; fourth, a vertical column of white light, with the sun for its 
base. 
The points of intersection of the first and second circles were adorned with 
two splendid parhelia of prismatic colors. The colors in the arc near the zenith 
were arranged as in the primary rainbow, the red being on the outer, or convex 
side. 
A similar halo occurred on the morning of March 16th, 1870, when the 
temperature was 12° above zero; though, in this case the zenith circle was com- 
plete, but not prismatic, and the second circle was adorned at the cardinal points 
by mock-suns of surpassing brilliancy. 
Morrison, Ill., Jan. roth, 1881. 
