176 



This circumstance enables us to point out with tolerable exact- 

 ness when the observation, as represented in the drawing, was 

 made. The interval between the primary and secondary bow being 

 somewhat above 8% the sun's altitude must have been about 4'. 

 Now, on Nov. 14, in lat. 54°. 36', this took place about thirty-five 

 minutes past three o'clock. It is said that it lasted at least ten 

 minutes, and till sun-set. Probably what was supposed to be the 

 setting of the sun was occasioned by its disappearing behind a low 

 cloud. As the phenomenon does not appear to have been observed 

 more than ten minutes, no material alteration would have taken 

 place in the relative positions of the two primary bows. 



