THE RANGE OF NATURE S OPERATIONS. 



215 



GROUP B (planetary INTERVALS). 



We have next to direct our attention to Nature's operations on a 

 great scale, and first to Group B. which deals with events within the 

 solar system. This group, like the others of our survey, mav con- 

 veniently l)e divided into subsections — ^/, r, and ir. 



B'/. the subsection of large planetary measures, indicates the place 

 in our table in which to record the distances of the planets from the 

 Sun, or from one another, as is seen from fig. 2. These distances are 

 most conveniently read out as so man}- metro-tens. 



The next subsection, i\ makes similar provision for representing the 

 distances of the satellites from their primaries, and for recording the 

 size of the Sun, which belongs to the same order of magnitude. This 

 appears from fig. 3, in which the distances may conveniently be 

 expressed as so many earth-quadrants, meaning by the "quadrant"' 

 1,000 stages, or 10,000 kilems, which is approximately the distance on 

 the earth's surface from the equator to the pole. 



Fig. 2. 



Distances of the Planets from the Sun, 

 in metro-tens. 



[The subsection Bu provides for all of these.] 



I 



GROUP B. 



I'l.ANETARY INTERVALS. 



Fig. 3. 



Distances of Satellites from their Pri- 

 maries, expressed in earth-quadrants. 



[The subsection Bv provides for all of these.] 



Bu 



00 



six := One metro-ten. 



GROUP B. 

 Planetary Intervals. 



Bv 



15 ■ 8 Mercury, 



i lO • 8 Venus. ' 

 : 15 Earth. 



: 22 • 8 Mars. 



Here come the minor planets. 



1 78 Jupiter. 



143 Saturn. 



287 Uranus. 



450 Neptune. 



