u 



Dr. C. Davison on Earthquake- Sounds. 



lyuamite, or a rocket ; a distant colliery explosion; distant 

 heavy rock-blasting, and the boom of a distant cannon. 



(7) Miscellaneous. — The trampling of many animals, such 

 as cows rushing on the turf below, a quick stampede of a 

 large herd of elephants, a number of powerful men struggling 

 desperately in the room overhead ; an immense covey of 

 partridges or a flock of starlings on the wing ; the roar of a 

 waterfall, the heavy rumbling of sea-waves in a cave, and the 

 breaking of waves on a pebbly beach ; the passage of a party 

 of skaters, the falling of fine rain or hail on the leaves of 

 trees, a low pedal note on the organ ; and the rending or 

 settling together of huge masses of rock. 



Frequency of Comparison to different Types. — The type 

 of comparison employed varies not only in different earth- 

 quakes, but in different parts of the disturbed area of one and 

 the same earthquake. This is shown by Table L, in which 

 the figures denote the percentage of entries under each type 

 with regard to the total number of comparisons. 



Table I. 







4 







m 



S3 



o 





m 



TO 



o 



Earthquake. 



£ 



a a 

 o •£ 







02 



o .9 





a 



c 

 ^ 





i— 1 



Wagg 

 pas 



c 







O T3 



JO 



O 

 02 - 



9 



Cornwall, May 17, 1892 ... 



4 



22-7 



22-7 





6-8 



23 



43-1 



2-3 



Aug. 27, 1895... 



4 



334 



46-7 









200 





Jan, 26, 1896 ... 



3 or 4 



26-7 



56-7 









167 





Apr. 1, 1898 ... 



4 



25-0 



36 4 



5-7 



2*3 



2-3 



239 



45 



Hereford, Oct, 6, 1863 ... 



8 



37-4 



25-7 



7-6 



2-9 



6-4 



12-8 



70 



Essex, Apr. 22, 1884 



8 



40-0 



32-0 



16-0 



4-0 





8-0 





Inverness, Nov. 15, 1890... 



7 



62 3 



10-0 



7-8 



33 



56 



8-9 



2-2 



Pembroke, Aug. 18, 1892... 



7 



44-5 



29-0 



6-7 



2-2 



1-8 



49 



11-1 



Leicester, Aug. 4, 1893 ... 



5 



51-1 



33-7 





2-2 



1-6 



92 



2-2 



Pembroke, Nov. 2, 1893 ... 



7 



51-0 



20-4 



60 



32 



3-2 



8-8 



74 



Exmoor, Jan. 23, 1894 ... 



4 



40-5 



432 



5-4 



• • 



2-7 



54 



2-7 



Hereford, Dec. 17, 1896 ... 



8 



45-4 



15-0 



155 



3-9 



2-7 



7-2 



10-3 



The four Cornish earthquakes were all weak and originated 

 in foci of comparatively small linear dimensions. The 

 Exmoor earthquake, though not much stronger, resembled 

 the remaining shocks in having a long focus. In these 

 cases, reference is made more frequently than in the first 

 to passing waggons &c. and less frequently to explosions 

 and the firing of heavy guns. Again, in the Comrie earth- 

 quakes of 1839, the sound which accompanied the more 

 violent shocks appeared " to resemble thunder more than 



