252 BARNARD— SELF-LUMINOUS NIGHT HAZE. [April 21, 



haze in the north and northwest. At I5h om a large mass 10° high 

 was visible in the northwest. Later there was a long diffused strip, 

 10° wide, which cut the Milky Way at right angles 20° above 

 a Cygni. It was 40° or 50° in length and did not fluctuate. Its 

 appearance was that of luminous haze. Below it was a region of 

 luminous haze that extended to the north. 



191 1, February 28, 1511 30m. For 20° to 25° altitude all over 

 the east and northeast the sky was luminous with a soft auroral 

 light. There was no arch or intensification near the usual place 

 for an aurora. This was not due to the presence of the ]\Iilky Way 

 at that point. 



March 2, 8h lom. A long mass of luminous haze 6° or 8° 

 broad was visible below (3 Leonis in the east. It diffused down to 

 the northeast horizon. It seemed to be brighter at times, but there 

 were no certain fluctuations of its light. It was not bright. 8h 50m. 

 The region of luminous haze was passing over Arcturus and moving 

 towards the east horizon. It was nearly horizontal and 30° long 

 with the north end the lowest. loh 45m. A long mass of luminous 

 haze was visible one half way from Spica to the southeast horizon. 

 It extended south as far as Corvus and inclined to the southeast 

 horizon. It was quite bright and steady in its light. All of the 

 southeastern sky strongly resembled the glow from an expected 

 moonrise. iih 35m. A strong glow from the southeast horizon 

 extended up to 15° or 20° above Jupiter — like a strong moonrise — 

 all along from the east to the south and dift'using upward. It was 

 conspicuously strong. By this time the sky was increasing in 

 luminosity. In the meantime there had been no trace of aurora 

 during the night. These were the first of the luminous masses of 

 haze that I had seen for a long time, except that of February 28, 

 when it appeared near the northeast horizon. 



Since the above observations I have not seen any of this luminous 



haze on the few clear nights that we have had in the absence of 



the moon. 



Yerkes Observatory, 

 April 4, 191 1. 



