56 



PHILOSOPHICAL TRANSACTIONS. 



[anno 1756. 



A Table of the Value of an /Innuity of one Pounds payable yearly ^ during a 

 Life of any Age, allowing compound Interest at 4/. per Cent, per Ann. com- 

 puted from the Table of the Decrements of Life, constructed by the Reverend 

 miliam Brakenridge, D. D, F. R. S. Inserted Page 601, vol. x. 



CXF. Of an Earthquake felt at Cologn, Leige, Maestrichty &c. on the IQth 

 of November, 1756. By Mr. Abraham Trcmhley, F.R.S. Translated 

 from the French, p. 893. 



There was felt, at 3 in the morning, a shock of an earthquake, at Cologn, 

 Leige, Maestricht, in the country of Limhurg, and, as appears, in all that be- 

 tween the Meuse and the Rhine. One of almost the same kind was felt in the 

 same places on the 3d of June. You saw by the account, sent on the 1 1th of 

 May, that earthquakes were very frequent in this country in the begiiming of 

 this year. The shock, which has been lately felt in these parts, as well as in 

 Portugal, shows that the cause of earthquakes is still active. Persons very at- 

 tentive observed, that in the neighbourhood of Lisbon for several days after the 

 1st of November, 1755, those who lay on the ground, perceived a motion under 

 them, which they compared to the beating of the pulse. They mention like- 

 wise, that after this motion ceased to be felt, there was perceived another, which 

 they compare to that felt in a boat on a river, the current of which is very slow. 

 Those only who lay on the ground were sensible of this motion ; for such as 

 were sitting on chairs, or standing, perceived nothing of it. 



CXFI. An Account of a Treatise, in Latin, presented and dedicated to the R.S., 

 intitled, " Gottlob Caroli Springsfeld, M. D., &c. Commentatio de Prcproga- 

 tiva Thermarum Carolinarum in Dissolvendo Calculo Vesica' pr^ Aqua Calcia 

 Vivce. By William JVatson, M.D. at Madrid, and F.R.S. p. 895. 

 Dr. Springsfeld's Treatise, which he lately communicated to the r. s. contains 



a series of experiments and observations on the Carlsbad waters in Bohemia, as a 



