Ann Arbor Scientific Association. ig 



August 7th, 1875, 



The Association met at the usual time and place, Dr. Pres- 

 cott, Vice-President, in the chair. 



The minutes of the preceding meeting were read and ap- 

 proved. 



The names of the following persons were received for mem- 

 bership and referred to the Board of Censors : Israel Hall, Henrj' 

 W. Rogers, Miss Kate Hale, Mrs. E. D. Kinne, Miss Kate 

 Watson. 



Prof. Merriman was here introduced, and read a paper on 

 '•'■ Halos and Parhelia,'''' of which the abstract follows : 



The most usual forms presented by these phenomena are the 

 following : 



1. A colored circle or halo around the sun at a distance 

 from it of 22°, and 2° to 3° in width, quite similar to a rainbow 

 with the order of the colors reversed. 



2. A second and similar circle about the first, at a distance 

 of 46° from the sun. 



3. An incomplete circle or inverted arc, also colored, tan- 

 gent to the second halo at its highest point. 



4. Two arcs tangent to the lower half of the second halo, 

 and equally distant from its lowest point. 



5. Short inverted arcs at the top and bottom of the inner 

 halo. 



6. A white band of light passing through the sun, parallel 

 to the horizon, and not unfrequently extending quite around it. 



7. Luminous spots, called parhelia., or, more commonly, 

 "mock suns," where the horizontal band crosses the first halo, 

 and sometimes, also, at other points on this band. 



The same phenomena, but less brilliant, appear also about 

 the moon. 



