394 
Scientific Intelligence. 
15. Ona solar halo, seen at Crawfordsville, Ind., (lat. 40° 03'); by 
Prof. 
.L.Campsext. (In a letter to the Editors, dated Wabash College, 
Crawfordsville, May 27, 1865.)—Herewith I submit a pe de of the re- 
markable appearances in the atmosphere on May 26th, 1865. 
he morning was hazy and cool—the thermometer at 5 ranging about 
48° to 50°. 
About nine o'clock a series of 
ble at six 
correct re 
nomenon 
o’cl 
o’clock in the afternoon. 
nying diagram is a 
presentation of the phe- 
as it appeared at twelve 
scribed about the sun as a center 
with an 
angular radius (SE) of SQ 
e accompa M I 27 ¢ 
ph \ KR 
ock, noon. Z 
The most brilliant ring was de- \ 
3 
twenty- eit degrees by careful 
measurem 
un), Primary center; A, Sec 
Ss 
The ar were white, yellow, meee B and C, Tertiary Si pari 
=220 SM= D. 
d and 
carpe il brilliant. The yellow yo 
and re 
en, =AD, SM=44° Grand axis 
re The white was ce ecu ek. 1 Paranal 
F. 
ere also very bright. 
The "he th of this series of bands forming the primary ring was 
about one and a half de 
The a are 
7-four 
MLG described el the sun as a center with a radius of 
degrees presented less brilliant, but well defined colors in the 
reversed order,—the white band being on the outer circumference, and 
the green 
within, —with another inner band of violet. 
At A on the circumference of the primary circle, the center of the 
ee was located. The radius of this circle was the — as that 
mary-—its circumference passing directly through the su 
ring was chiefly white light, of less brilliancy we as primary, 
yet very sharply marked throsghont its entire cireumfere 
From D the arcs DF and DG branched off crcteaiaeriealle with refer- 
ence to the axis MSD, indicating the centers of curvature at B and C, 
the intersections of the secondary circle with the primary. 
These arcs were of white, well defined, mellow light. 
The long continued and well defined manifestation of the phenomenon 
enabled us to take all our observations very carefully, and to repeat them 
for further accuracy, 
1 
I relations of the centers of these curves are cur jous 
metrical 
oa interesting, and the record of these positions may be es some value 
with future observations of the same char. 
tion of these ‘appearances there are some difficulties not 
iter eee in discussing halos. For the present the nicer of 
uly is made. — 
