British Association, 85th Report, Manchester, 1915.] [Plate IV. 



''-^''^M^M^Vtft^^.nMMIIfMMftft^lillf/MMlfUi' - 



.^vvvww/Ay;'s_ 



'-«~>'*vvAVllVW/"^ 





~vwvwwiiv'.v<'iV.Vi'<-w n^ -."f 



■y/^'i 



1,1'" 



'^f, 



^,\ 





Fig. a. 

 St. Helena, May 21-22, 1915. 

 The effect of insects on a seismograph at St. Helena. This continued for ten days. 



1915. [Opened -June 11,21, 23.] 



[Closed June 12,21, 16.] 

 Fig. B. 

 The work of a spider on the seismograph at Bidston. 

 He continued for eight days, until removed. 



Illustrating Befort on Seismological Investigations. 



\_To face page 65, 



