ZONE OF PLANETS BETWEEN MARS AND JUPITER. 85 



orbits intersect, although some of them approach within 

 moderate distances of each other. The orbit of Fortuna 

 approaches the orbit of Metis within less than the Moon's 

 distance from the earth. The orbit of Massilia approaches 

 almost equally near the orbit of Astrsea, and the orbit of 

 Lutetia to that of Juno. 



PLAJfETAEY ORBITS. 



It is evident, then, at a glance, that these forty small 

 planets sustain to each other a relation different from that 

 of the other members of the solar system. We see a 



