up and down the great western mountain range. It is possible that investigation will show that greater gravitational force is exerted at these points, and that thus the number of meteorites drawn in is there

Map of Known Meteorite Falls and Finds up to 1903.

increased, or, again, mountains may present actual mechanical obstacles which stop and accumulate meteorites. Whether either of these hypotheses has any foundation in fact, however, is not known as yet. There are again remarkable differences in the kinds of meteorites