1883.] 263 (Kirkwood. 
have been expected in one who, not only in the close, 
but during the greater part of his matured life, had 
been governed in all his acts by a paramount sense 
of duty. 
I met with, some years ago in a newspaper, the fol- 
lowing lines, of which I have not been able to ascer- 
tain the author, but which.seemed to me so applicable 
to Mr. Seybert that I gave him at the time a copy of 
them, which will probably some day be found among 
his papers : 
I slept, and dreamed that life was beauty, 
I woke, and found that life was duty ; 
Was thy dream then a shadowy lie ? 
Toil on, worn heart, unceasingly, 
And thou shalt find that dream to be 
A truth, and noon.-day light to thee. 
The Zone of Asteroids and the Ring of Saturn. By Professor Daneel Kirk- 
wood, 
(Read before the American Philosophical Society, Oct. 5, 1883.) 
Evidence in support of the following theses was published by the 
present writer in 1866-7 
Le 
In those parts of the zone of minor planets where a simple relation of 
commensurability would obtain between the period of an asteroid and 
that of Jupiter, the original planetary matter was liable to great pertur- 
bation. The result of such disturbance by the powerful mass of Jupiter 
was the necessary formation of gaps in the asteroid zone. 
Il. 
The great division in the ring of Saturn may be expl: ained by the dis- 
turbing influence of the satellites, and the more narrow division discov- 
