W. W. Johnson—Solar Halo. 439 
Art. LIX.—On a Solar Halo; by Prof. W1LL1AM WooLsEY 
JOHNSON, of Kenyon College, Gambier, Ohio. 
THE accompanying diagram represents a combination of solar 
halos witnessed by myself and others at Gambier on the morn- 
ing of March 2nd, the sun having an altitude of about 40°. 
The double circles represent prismatic halos, the single cir- 
cles white ones. The halo of 22° and its contact arcs were red 
on their inner edges. The short arc above and the lateral ares 
were blue on the inner edge. The points of contact on the 
halo of 22° were intensely bright. The upper contact are was 
plainly elliptical in form, the lower too short to exhibit decided 
curvature. 
_ Jue taterat ares possessed the brightness and apparently about 
the curvature of the ordinary rainbow. Hach rose above the 
horizon to a height equal to 3 of its radius, leaving the center 
depressed about 2 of a radius below the horizon. The diagram 
being first constructed upon a globe, it appeared probab 
the centres were situated upon the creat circle of which the sun 
is the pole, and at distances of 120° from each other and from 
the culminating point of this circle. 
Gambier, 0., March 25, 1872. 
