BIBLIOGRAPHY OF IIERSCIIEL's WRITINGS. 55! 



Herschel, W.: Synopsis of the Wi:itings of— Continued. 



A.D. Yul. P. 



1793 83 204 The observations and drawinjis (one .uiven in Plate XXII, fig 1), HrtO, 



Jnuo 19, 21, 23, 24, 25, 26, 28, 29, 30, and July 3, showed that Venus 



has a motion on her axis, and as evident ly that she has an atnios|)hore. 



206 1789, Nov. 30: no satellite visible; ii" she has one it must be below H 



or 9 niagnitnde. 

 206 Two measures of the diameter, 1791, Nov. 24. 



215 My observations show that the atmosphere of Ven us is of Tunch greater 



extent or refractive power than as given in the paper [of Sen UOKTF.R. ] 



216 As to the mountains in Veints, I may venture to say tlnxt no eye which 



is not considerably better than mine, or assisted by nmch l)etter iu- 

 strnments, will ever get a sight of them. 



217 The diameter of Fenus at the mean distance of the earth is 18".79. 



218 The appearance of the luminous border of Venus as I have described 



it, i. c, suddenly much brighter all around the limh, has not been noticed 

 by the author we have referred to. 

 218 The cause of this appearance may probably be ascribed to the atmos- 

 phere of Venus, which is probably replete with matter that retlects 

 and refracts light copiously. Therefore on the border, where we 

 have an obli(iue view, there will be an increase of this appearance. 



1794 84 28 Observations of a qniniupJe belt on the Planet Saturn. By William 

 Herschel, LL. D., F. K. S. Read December 19, 1793. 

 28 In some of my former papers I have established the spheroidical form 

 of Saturn and pointed out the motion of a spot on its disc. From 

 the first we infer a rotation on its axis ; the second shows that it 

 has such a motion. 

 My late observations seem to hint to ns that the period of rotation is 

 not of long duration. 

 28 Observations of the (luintuple belt ; see Plate VI, fig. 1. 



30 Observations of belts on Jupite)-; see Plate VI, fig. 2, tig. 3. 



31 Belts are connected with the rotation of the planets. Since then it 



appears that the belts of Saturn are very numerous, like those ot 

 Jupiter, and are also placed in the direction of the longest diameter 

 of the planet, it may not be without some reason that we niter the 

 period of the rotation of the former to be short like that ot the 



latter. 

 31 I have never seen parallel belts on Mars nor on Venus. 



1794 84 39 Account of some particulars observed during the late erUpse of the sun. 



[1793, September 5.] By William Herschel, LL. D., 1. K. te. 



Read January 9, 1794. 

 39 Observations. See Plate VII, figs. 1, 2, 3. 

 39 At first contact two mountains of the moon were seen on the sun ; 



see fig. 1. , ^ . 1 ^■^.4.^ 



41 The cusps of the sun attentively inspected, and I suspected a little 

 bendin.- of the cusps outward as in fig. 4; but I could not satisfy 

 myself "of its reality. If there was a bending, it did probably not 



amount to 1". , . , x ^ i j ino 



41 [Foot-note.] In 1779, 1780, 1781, I measured the heights of about 100 

 mountains of the moon by three dilferent methods. Some of these 

 observations are given in Fhil. Trans., Vol. Ixx, p. 507, but most 

 remain uncalculated in my jounial till some proper opportunity. 



Wm. Herschel. 

 [Dated] Slough, near Windsor, Dec. 30, 1793. 



