Sir John Lubbock’s Address. 848 
Arr. XLVII.—Address of Sir John Lubbock, President of the 
British Association at York. 
{Continued from page 289.] 
* * In Astronomy, the discovery in 1845 of the planet Nep- 
tune, made independently and almost simultaneously by Adams 
and ‘by Le Verrier, was certainly one of the greatest triumphs 
of mathematical genius. Of the minor planets four only were 
known in 1881, whilst the number now on the roll amounts to 
220. Many astronomers believe in the existence of an intra- 
mercurial planet or planets, but this is still an open question. 
The Solar System has also been enriched by the discovery of 
an inner ring to Saturn, of satellites to Mars, and of additional 
satellites to Saturn, Uranus and Neptune. 
The most unexpectéd progress, however, in.our astronomical 
knowledge during the past half-century has been due to spec- 
trum analysis. 
