and especially/ in Scotland, 27S 



felt by him to have been the same as in "a vessel falling from 

 the top of one wave and rising again upon the next." The 

 account given under date 27th May 1773 is still more distinct ; 

 for it is there stated, that during a severe shock which caused 

 great cracks, *' a field of young oats was seen to heave up, and 

 roll about like waves of water. The trees moved as if blown 

 by the wind, though the air was at the time calm and serene." 

 In the shock of 8th March 1750, a person who felt it relates, " I 

 perceived myself raised in my bed, and the motion began on 

 my right side, and inclined me towards the left." At Gibral- 

 tar, when the shock of the Lisbon earthquake arrived there, 

 " the guns on the battery were seen some to rise, others to 

 sink, the earth having an undulating motion.''* Other notices 

 to a similar effect will be found under dates 9th December 

 1780, 29th August 1781, and September 1839. 



There are some cases which, if they do not go the length 

 of proving a rolling motion of the surface, at all events shew 

 that objects are suddenly impelled forward by a shock. Un- 

 der dates March 1792 and March 1816, it is mentioned, that 

 articles, such as pictures, hanging by nails on the walls of 

 houses, were made to oscillate. In Holland, the shock of the 

 Lisbon earthquake, and the other in 1761, as noticed in the 

 two preceding tables, caused the candelabras hanging in the 

 churches to swing, and the candles hanging in a tallow-chan- 

 dler's shop to strike on one another. These, and the other 

 curious fact, that, on the tops of some of the steeples, the 

 weathercocks were simultaneously affected, may be explained 

 by supposing a sudden forward motion of the ground. But 

 it is most probable there was also a slight vertical motion ac- 

 companying it.f 



In one instance the amount of horizontal displacement is 

 given ; for it is said that the candelabra deviated from the 

 perpendicular to the extent of one foot. It is to be presumed 

 that the building to which it was suspended, was pushed for- 



* Discourses on Earthquakes, p. 322. 



t See " Amsterdam^' ju the Table for Earthcj^uakp of 31st Maych 176I, page 

 267 hereof. 



