258 A, C. Twining on Meteoric Rings, &c. 
It ought not to be overlooked, in passing, that multitudes of the 
ira 
comets—whose vastly extended atmospheres or heads around 
the nucleus, although greatly attenuated, may be competent >. 
arrest meteors completely—may be found, in rare instances, 10 
have been disturbed by impact with a meteoric ring whose 
back the age our solar system to at least a minimum 
of duration in its present Scmseas i 
