THE ASTEROIDS BETWEEN MARS AND JUPITER. 369 



From 210° to 240° 8 



From 240 to 270 10 



From 270 to 300 .- . 7 



From 300 to 330 22 



From 330 to 360 19 



In the semicircumference from 300° to 120° are 115 perihelia, aud in 

 the remaining 180° only 55; the clustering tendency being obvious in 

 the region adjacent to the perihelion of Jupiter. 



THE SIMILARITY OF ADJACENT ORBITS. 



12. An examination of Table II affords evidence of a similarity more 

 than accidental between adjacent orbits of the asteroidal growp ; a re- 

 semblance pointing to a common origin. The orbits in some cases so 

 nearly intersect that a future collision is by no means impossible. The 

 striking similarity in the magnitude, form, and position of certain orbits 

 will be seen by the following comparisons: 



I.— FORTUNA AND EURYNOME. 



Fortuna. Eniynome. 



Distance 2.4415 2. 443G 



Feriod 1393^.43 1395^.24 



Longitude of perihelion 31° 3' 44° 22' 



Longitude of ascending node 211° 27' 200° 24' 



Eccentricity 0. 1594 0. 1945 



Inclination 1° 33' 4° 37' 



II. — FIDES AND MAIA. 



Fides. Maia. 



Distance 2. G440 2. 6495 



Period 1570^131 1575<\29 



Longitude of perihelion 66° 26' 46° 21' 



Longitude of ascending node 8° 21' S° 17' 



Eccentricity 0.1758 * 0.1655 



Inclination 3° 7' 3© 5' 



III. — CLOTHO AND JUNO. 



Clotho. Juno. 



Distance 2.6679 2.6682 



Period 1591^^70 1591*^99 



Longitude of perihelion 65° 35' 54° 50' 



Longitude of ascending node 160° 44' 170° 5S' 



Eccentricity 0.2580 0.2579 



Inclination 11° 45' 13° 1' 



S 24 



