618 BIBLIOGRAPHY OF HERSCHEl's WRITINGS. 



Subject-Index. Philosophical Teansactions. Tear. Page. 



Retina: may be less sensitive along one of its diameters than along others. 1794 52 



Reviews of the heavens : 1st, 2d, and 3(1 1783 < ~ 



' (250 



Bhea : observations 1790 444 



Rotation of the planets 1781 115 



Satellites : may be more jionderous towards their primaries 1792 16 



Satellite to Venus : must be less than 8-9 mag. if it exists 1793 206 



Saturn : drawings 1790 2 



: (rough) drawings of it 1790 13 



: has an atmosphere 1790 15 



: turns on an axis 1790 16 



: is spheroidal 1790 17 



: Schroeter's observations criticised 1793 203 



: rotates in lO^i IG^^ 0.^4 J-2"i 1794 66 



: the shadow of the ring on the ball is broader at the ends than at 



the middle 1805 275 



: drawings 1805 279 



: observations on its singular figure [square-shouldered aspect].. . 1805 272 



: 1806 462 



: its figure, climate, and atmosphere 1806 455 



: drawings of it in 1789 and 1805 ' 1806 455 



: may change in color at its poles with its seasons 1806 464 



: has an atmosphere 1806 466 



: shadows of its ball and rings 1794 55 



Saturn's belts : observations in detail 1794 49-59 



: (quintuple) belts, with drawings 1794 28-31 



Saturn's ring : has an atmosphere 1790 7 



: 1808 163 



: principal division 1790 3 



: is as solid as the ball 1790 5 



: is brighter than the ball 1790 5 



: its thickness 1790 6 



: its atmosphere 1790 7 



: its edge 1790 8 



: its division is a real one, as proved by fHerschel's] observations. 1792 4 



: is brighter and whiter than the ball 1805 273 



: its figure, climate, and atmosphere 1806 455 



: the breadth of the ring is to the width of the space between ring 



and ball as 5 to 4 1806 463 



: has an atmosphere 1806 467 



/Safur's rings : dimensions 1792 5 



: the inner ring also revolves 1792 6 



: more than one division has been observed only four times 1792 8 



: are not of a changeable nature 1792 11 



: diameter measured 1792 11 



: the outer is fainter than the inner, etc 1794 53 



Saturn's satellites : see Mimas, Enccladus, etc. 



: Tables of their motion 1790 488 



Saturn's shadow : the shadow of the ring on the ball is broader at the 



ends than in the middle, 1806, June 3 1806 462 



: the shadow of ball on ring is not parallel to the outline of Saturn. 1806 463 



SCHEINER : 1795 47 



Schroeter: 1793 202 



