BIBLIOGRAPHY OF HERSCIIEl's WRITINGS. (ill 



VI. — Subject-Index to the scientific writings of Uerschel. 



riHLOSoPHiCAL Tr^vkbactions. Tear. Paj;e. 



Aperture : eifect of 1795 57 



: ailvantages of largo apertures 1800 255 



Apex of solar motion : (lefmed n-^:? 27U 



: defined and eousidored 1SU5 23'J 



: is not at, but near, A Ilerculis 1804 I5G0 



: isiuR. A. 245° 52' 30", N. P. D. 40^22' 1805 25G 



Asteroids: defined 1802 229 



Asteroid : justification of the name 1805 03 



Atmosphere of Mars, Venus, etc. : see Mars, etc. 



Atmospheric spectrum : of stars 1805 43 



Bayer's letters: do not indicate order of brightness. Examples 1790 174 



Bernard: 1792 14 



BiAXCHixi: 1793 201 



Binary stars : suspected 1782 143 



: see also Stars, and Double Stars. 



Bode: 1^11 292 



Bradley: 1~S2 84 



: 1795 47 



363 



33 1 



''''■' 305 



Brightness intrinsic and aggregate brightness defined 1800 .52 



Brightness of a star : defined 1800 .57 



Cassixi: 1792 9 



: 1792 14 



: 1793 201 



: 1795 47 



Catalogue of Double Stars 1~S2 112 



. 1785 40 



Catalogue of 1,000 new Nebulai and Clusters 1~S0 457 



Catalogue of a second thousand of Nebulas and Clusters 1789 212 



Catalogue of 500 new nobul;«, etc 1^0- -177 



Catalogues of the Comparative Brightness of the Stars : first 1790 KU) 



: second 1790 459 



: third 1-9' ^^^ 



: fourth 1^99 121 



Central forces : other than gravity 17^9 220 



Ceres : observations 1'^^-' -1"^ 



: its diameter is 102 miles 1802 218 



: it hasadisk ^^^ ^21 



f 100 



Classes of double stars : defined 1762^ to 



( 103 



Classes of nebulae: defined Ip^' ^^^ 



Clocks: (iised by Herschel) 1^1 1~| 



Clusters: definition '":' ~^ ' 



: are composed of stars of equal magnitude 1 ^s J i-lfa 



: are subject to central powers 1"-^ ^16 



: are ancient in proportion as their spherical form is completed .. 1789 | ^_^^ 



, ,. Iel4 265 



: their evolution 



