Stiles's Axiroral Observations. 169 



as to touch the stars in the Bear's tail, and be^an to vanish 

 or decay from the ])ole westward. East end of the arch 

 touched the horizon at E. 2° 8. by compass. Touched the 

 western horizon W. 20° N. by coni])ass. 



At 10'' 32™ I found the east end ascendin<>: from the hori- 

 zon, passed tliroucch Alpha of the northern crown, and 

 through the tail and back of the Great Bear, touching Beta 

 and Gamma. 



At 10'' 37"' all the arch west of the pole and meridian van- 

 ished, except a lucid beani or pyramid. At lO*" 44"" a renewal 

 of the arch westward. Arch south of Beta and Gamma Ursae 

 Majoris. A new horizontal beam arising i\nder the pole, 

 where the auroral lucidity continues. At 10'' 48'" nearly 

 evanished, breaking up a})ace. At 10'' 52"" whole arch quite 

 evanished. At 11'' aurora under the ])ole still, and extending 

 N.E. as high as Cor Aquila>, and to bright stars in Cassiopeia, 

 and a sensible light as high as the pole star. 



At 11'' 10'" aurora continues in the north under the pole, 

 and a lucidity on Cor Aquila'. At midnight, dark cloud lying 

 along under the pole, interstreaked with horizontal lights. 

 Aurora seems breaking up. 



The bow continued for three-quarters of an hour, the most 

 of the time well defined, all the time rising toAvard the ze- 

 nith, passing 32° on the meridian in forty or forty-five min- 

 utes. But the horizontal ends of the boAV or zone did not 

 move so much. 

 1781, Mar. 28, at lU'', a small Aurora Borealis. 



' Apr. 13. Considerable Aurora Borealis about 9^''. 



' Apr. 14. Small Aurora Borealis, 



' Apr. 15. Faint Aurora Borealis, low. 



' Apr. 17. White A.B., two-thirds up to pole. 



' May 11. A, B. 2 hours high, and three-fourths round the horizon. 

 Observed at East Hartford, Conn. 



' May 17. Considerable A. B. ; observed at Brimfield, Mass, 



' June 7. A.B. 30° high; from N. 30° E. to S. 5° W. 



' June 9. Aurora Boi*ealis, great and difiused. 



' June 20. Sn\all Aurora Borealis. 



' July 9. Small Aurora Boi*ealis. 



' Aug. 8. Small A.B., (Coruscations two-thirds up to pole star. 



' Aug. 1 7. Small Aurora Borealis. 



' Aug. 20. Small Aurora Borealis. 



■' Sept. 18. Aurora Borealis, 5° high. 



" Sept. 25. At 7" 20"' an arch about 20° above the horizon in- 

 clining toward the Avest. At 8:^'' the coruscations tend to- 

 ward a point in the zenith, one streak in the west very red : 

 ascend in flames similar to the coruscations from a large fire. 

 The flashes extended nearly to the S.W. The flashes as- 

 cended with great rapidit3^ Its continuance about a quarter 

 of an hour. At Sf' an arch similar to the first, about 30° 

 high. At an instant, another arch over the first about 40° 

 high, both inclining toward the west. Streaks up from the 

 first arch, very bright, but no flashing. The coruscations 

 ascend in the form of a cone. They point in the zenith. Im- 

 mediately upon that, the flashing began in the east and west 

 with great rapidity. A bright moonlight evening. At 9"* 

 little or no appearance of any light. 



