560 



helia at 1'45 P.M. : Sun's altitude 39 15'. A circle of diameter 101 

 running round heavens and passing through the sun, intersected by 

 another circle, radius 22, having the sun for its centre. Another 

 intersection took place at 27 30' from the sun, on each side, by an 

 arc (perpendicular), which coincided with the previous circle at an 

 altitude of 22 from the sun. Four parhelia appeared, one on each 

 side of the sun, one above and one below ; through the lower one 

 passed part of an arc of another circle. Polariscope applied to left- 

 side parhelion and also to halo, slight polarization of outer or left 

 image ; instrument held in a plane parallel to a line joining parhelion 

 and sun. 



July 16th, 1858, 10'40 P.M. Prismatic parhelia 22 30' on each 

 side of sun ; altitude 7. Polariscope held in a parallel plane ; 

 parhelion on left of sun looked at ; slight polarization ; bright image 

 and eye-mark both to the left hand. 



November 8th, 1858, 10A.M. Prismatic parhelion distant about 

 23 from each side of sun ; altitude 6. Polariscope applied to left 

 image, held horizontally (parallel), eye-mark to left ; slight polariza- 

 tion, image to left and further from sun brighter. Instrument held 

 in same plane, but with eye-mark to right, applied to right parhelion ; 

 similar slight polarization, image to right and furthest from the sun 

 brighter. 



March 30th, 1859, 4 P.M. Prismatic parhelia about 23 distant 

 from each side of sun. Polariscope applied to image on left of the 

 sun, held parallel, eye-mark to left ; slight polarization, image to left 

 and further from the sun brighter. Instrument held in same plane, 

 but eye-mark to right ; slight polarization, image to right and outer 

 being the brighter. 



April 21st, 1859, 7 P.M. Prismatic parhelion and part of halo 

 on each side of sun distant about 22 30 f . Polariscope applied to 

 left-hand image, held in a parallel plane, eye-mark to left ; medium 

 polarization, the left or outer image brighter. Instrument held in 

 same plane with eye-mark to right, and applied to right-hand image ; 

 similar medium polarization, image to right and further from the sun 

 brighter. 



May 1st, 1859, 6 P.M. Prismatic parhelion with part of a halo 

 on each side of sun distant 23 (about). Polariscope applied to left 

 image, held parallel, eye-mark to left ; slight polarization, left or 

 outer image brighter. Instrument held in same plane, eye-mark to 



