Nov. 9, 1883.] 



♦ KNOWLEDGE ♦ 



201 



period ; and so that particular case of synchronism would 

 be eliminated. In millions, or perhaps tens or hundreds of 

 millions of years, nearly all cases of synchronism would in 

 that way be eliminated. 



synchronise with Jupiter's in various simple ways, are 

 indicated, and also all the asteroidal mean distances at 

 present known. "When Professor Kirkwood first noticed 

 the peculiarity, not half as many asteroids had been dis- 



TATllS UF THf] ASTKUOlDs!, 

 Distributed accorciiug to tlieir Mean Distances, sliowinf,' tlio gaps at tlioso distaucos where the Orbital Revolution would. 



s}-uchrouise with Jupiter's. 



Whether such a process has been at^work or not in the 

 asteroidal system let the illustrative*picture show, where 

 the distances at which asteroidal movement would 



covered. Yet still, as more and more are found, vho law 

 more and more clearly indicated. 



(To be continiteil 



