RANSOME.] 
COORDINATION OF THE FISSURES. 
47 
while the northwest-southeast fissures are the more persistent in the 
southeasl quadrant. 
In the accompanying diagram (fig. i) the lodes represented upon 
the map have been platted as straight lines passing through a com- 
mon centra] point. In the ease of moderately curved fissures the 
line represents the average general direction. A few sharply curved 
lodes have been treated as if they were formed by two intersecting 
fissures, and represented in Hie diagram by two lines. The figure 
Fig. 1.— Diagram showing courses of sortie of the lode fissures of the Silverton quadrangle. 
brings clearly before the eyes the great variety of direction assumed 
by the relatively few fissures which have been mapped as lodes. It 
fails, on the other hand, to express the relative persistency* and indi- 
vidual importance of the various fissures represented, and in so far 
Only partially brings out the prominence of the northeast-southwest 
and northwest-southeast lodes. 
In a region traversed by such a great number of fissures, trending 
in so many different directions, it is not difficult to construct fanciful 
'clat ionships. Few of the latter are more popular than that which 
