A SWARM OF MPM^EORITES, AND ON THEORIES OF COSMOGONY. 
69 
it is better to risk error on the chance of winning truth, lb me, at least, it appears 
that the line of thought flows in a true channel; that it may help to give a meaning 
to the observations of the spectroscopist; and that many interesting problems, here 
barely alluded to, may, perliaps, be solved with sufficient completeness to throw light 
on the evolution of nebulse and of planetary systems. 
