ON EARTHQUAKES, 1925-1930 233 
gated to the notes in the I.S.S., as cases where there is not sufficient material 
_ to give an epicentre. Many of them are records at a single station only, 
unsupported by any independent observation. On some days there are only 
_ sporadic observations of this kind, with no serious shock; but no day in 
the six years is completely blank. It will be seen that the number of residual 
observations of this kind is given, on days when there are also several 
- considerable shocks, against the last shock for that day.” 
University Observatory, Oxford. ee. Eee 
1935, june 13. 
22s 
