788 



PLATE XXXI. 



Fig. 453, 454. The appearance of the star Lyra, 

 viewed with telescopes magnifying 460 and «J450 

 times respectively. From Dr. Herschel. P. 491. 



Fig. 455. The appearance of the nebula in Orion, 

 abont lialf a degree in length. From Messier. P. 492. 



Fig. 456 . . 463. The appearances of different nebu- 

 lae. From Dr. Ilerschcl. P. 492. 



Fig. 464. A section of the nebula to which the sun 

 is supposed to belong, its projection forming the milky 

 way ; taken in a plane perpendicular to its longest dia- 

 meter. From Dr. Herschel. The large stai in the 

 middle represents the sun, and the circle drawn round 

 itis at forty times the distance of the nearest fixed stars, 

 comprehending probably all the stars which are visible 

 to the naked eye. P. 493. 



Fig. 465. A large spot, traced through different 

 forms in its path across the sun. From Dr. Wilson. 

 A is its place 23 Nov. 1769; B, 24 Nov. C, 11 Dec. 

 D, 12 Dec. and E, U Dec. P. 501. 



Fig. 466. A, a large spot on the snn; B, the ar- 

 rangement of the luminous and opatjue strata of clouds 

 by which Dr. Herschel explains the appearance of the 

 spot. P. 501. 



Fig. 467. A, a spot with a lighter portion in the 

 middle; B, the arrangement of the strata correspond- 

 ing to it. P. 501. 



Fig, 468. The position assumed by the strata which 

 had formed the spot shown in the last figure, viewed 

 about an hour afterwards. P. 501. 



Fig. 469. A and B are the forms of a solar spot, 

 at about two hours distance of time; C, D, and E, 

 are the successive forms of another spot. P. 501. 



Fig. 470. The appearance of the zodiacal light, or 

 solar atmosphere, as it is seen in these climates, in the 

 evening, about the beginning of March ; A B being the 

 horizon, and C the supposed place of the sou. P. 

 SOS. 



