80 THE HAMILTON ASSOCIATION. 
his calculations to Prof. Airy ; the planet was seen but not reported 
on. 
The accompanying diagram will illustrate the disturbing action 
of Neptune upon Uranus. ‘This shows the positions of the two 
planets from the discovery of Uranus to that of Neptune. We see 
that from 1781 to 1822 the influence of Neptune tends to draw 
1822 
o> 1781 
rbhre OF pranv?* 
Uranus in advance, while from 1822 to 1846 to retard it. Here we 
have the discovery of Neptune. In its simple grandeur it is splen- 
did, and of the highest order from a philosophical point of view, for 
it proves the security and precision of the data of modern astronomy. 
Now we have found Neptune, and find him to be the most 
remote planet known of our solar system ; and I presume you are all 
