A COMPARISON OF SEISMOLOGICAL STATIONS.

Abstract

were only three suitable South American shocks and they were finally combined with North America. A preliminary rough discussion suggested that a useful standard of comparison would be the fraction of the residuals that lie between f 4s inclusive. This method has the disadvantage that a residual of 5 8 is treated as badly as one of 1 5 8 , but thelabour of a fuller treatment would have been prohibitive. The ratio of the number of residuals 1936