J. W. Jackson — Carboniferous Fish-remains. 309 



415 square miles. Gun practice was, T am informed, being carried out 

 on the Plain, and there can be no doubt, I think, that this was the 

 origin of the disturbances, for the following reasons :— 



(i) The wind at the time was from west and north-west. 



(ii) The disturbances occurred at nearly regular intervals, on each 

 occasion lasting from 15 to 20 minutes. 



(iii) The impulses obviously travelled through the air, shaking 

 windows, etc., but in no place giving rise to a characteristic earth- 

 quake-shock. 



(iv) The sound was compared either to thunder or gun-firing (in 

 several instances to gun-firing on Salisbury Plain) — in the west part 

 of the area always to gun-firing, in the centre more frequently to gun- 

 firing than to thunder, and at the east end more frequently to thunder 

 than to gun-firing. The area over which the disturbances were observed 

 stops short of Salisbury Plain by several miles ; for, as usual, in the 

 immediate district the reports would be at once assigned to their true 

 origin. 



Barnet: March 15th, 1905.— A sharp shock was felt at 1.59 p.m., 

 shaking doors and windows, and a loud sound was heard. The 

 disturbance was also heard at Hadley (near Barnet). 



Llangollen: Maij \st, 1905. — At 1.40 a.m. a shock was felt at the 

 Shropshire Militia encampment near Llangollen. The vibrations 

 lasted 4 seconds and travelled from east to west, and were accompanied 

 by a dull rumbling sound resembling thunder. Though I can assign 

 no definite cause for the disturbance, it is quite improbable that a 

 shock of such intensity should not have been felt in the surrounding 

 country. 



Ashbourne : April 2ord, 1907. — A slight shock is said to have been 

 felt during the early hours of the morning in the Ashbourne district 

 and at Uttoxeter. Numerous inquiries have resulted in negative 

 evidence only, with the exception of one account from Church 

 Broughton, where a shock of intensity 5 was felt at 12.40 a.m. If 

 this disturbance were of seismic origin it could not fail to have been 

 more widely felt. 



Dochffarroch (near Inverness): July l^th, 1907. — The Imerness 

 Courier reports three shocks at 3.20 a.m., 4.35 a.m., and 6.15 a.m., of 

 which the second was the strongest. Dochgarroch lies close to the 

 epicentres of most of the earthquakes of September, 1901, and it is 

 possible that slight local shocks may still be felt there. The evidence 

 on this occasion, however, probably rests on the experience of a single 

 observer. 



IV. — Cakbonifeeotjs Fish-Eejiains in North DEKsrsHiEE. 

 By J. "Wilfrid Jackson (of the Maachester Museum). 



SOME time ago Mr. E. Cairns, of Ashton-under-Lyne, sent me for 

 identification a large collection of fossil fish-teeth, which he had 

 obtained in a limestone quarry near Sparrowpit, in North Derbyshire, 

 not far from the celebrated " ebbing and flowing well." 



Later on, at his request, I went through his large collection and 

 made a further selection, and also paid a visit to the quarry myself 



