296 SOLAR SPOTS OBSERVED AT TORONTO. 



February 5tli. Spots are now near the centre of the Sun — remark'^ 

 ed two bright spots, with dark circles towards the Nucleus, in the 

 Southern Penumbra — Penumbra generally had a jagged look. 



February 6th. Definition indifferent — light scud passing over Sun, 

 the Penumbrse of small spots forming angles towards the centre of the 

 Sun — the Penumbra surrounding the small spots lighter than the 

 Penumbra of the principal one. 



February 10th. Definition very indifferent — ^heavy wind and scud 

 flying over Sun — prominent Faculse near north-eastern limb, as if a 

 spot was about to appear — large spot much diminished in size — only a 

 little larger than the lower one. 



February 12th. Definition indifferent — new spot appeared in north- 

 eastern hmb, in position indicated by the brilliant Paculse on the 

 10th instant — most brilliant Faculse all round the spots in the western 

 limb, their extent marked by dotted line in the accompanying drawing. 

 February 13th. Spots still on the sun, but the definition so vile 

 that no drawings of them could be made — from edge to edge of Pen- 

 umbra=75 seconds. Observed same spots again on 13th and 17th 

 of March (see drawing appended), extent of edges of Penumbrse of 

 both spots, A A,=1I3 seconds, or 52,658 miles on the 17th March. 

 The appearance of portions of the Penumbra between the Nucleus of 

 the spots gave some impression of a vortex, the Penumbra being 

 stretched, and the streaks parallel to its edges generally — observed 

 some small spots near Sun's centre, and spots also going off and com- 

 ing, in the western and eastern limbs. 



March \1\h. Observed two large spots on south-eastern limb ; these 

 spots to my vision had all the appearance of cavities when I first saw 

 them near the Sun's limb on the 8th instant. On the 12th I measured 

 the diameter of the two principal spots with a parallel wire Microme- 

 ter, from the exterior edges of the Penumbra which enclosed both 

 Nuclei of the two spots — the diameter was 75 seconds. I measured 

 the same again on the 13th, when the spots were near the Sun's centre ; 

 the extent from edge to edge of the Penumbra was 2 minutes. Since 

 communicating the results of these observations to the Canadian In- 

 stitute, I have continued to note the changes which occurred, and 

 especially observed those affecting the dimensions of the spots 

 measured on the 12th and 13th. On the 17th I again measured 

 the distance from edge to edge; it then was 113 seconds, which 

 is equivalent to 52,658 miles. The appearance of the spots on the 

 17th March is given in the accompanying diagram. There were sev- 



