On the Effects of Terra Ponderqfa. 6 1 1 



" their woful experience they found the fad 

 *' effefls of it, for in about nine hours afterwards 

 *' they both expired. The like quantity of this 

 *' in about three hours time will kill a dog ; 

 " and it is obfervable that the dog while living 

 ** is deeply lethargic, which may farther illuf- 

 '* trate to us, in malignant Fevers attended with 

 " thofe Symptoms, what kind of matter proba- 

 " bly it is that caufes thofe Symptoms ; but that 

 *' is more fully difcufied in its proper place. 

 *^ Nay fo fpreading is the poifon of this Spar, 

 *' that it has not only been fatal to the creature 

 ** that has taken it, but a dog, by licking the 

 " blood of a Swine which had taken it acciden- 

 *' tally mixed with meal and butter, expired 

 " likewife ; and it is farther obfervable, that 

 " the flefh of the Swine was afterwards eaten, 

 " and did no mifchief though the blood was 

 " poifonous J becaufe, as wc may reafonably 

 " conjedlure, the Arfenic had not fpread itfelf 

 " farther than the mafs of the blood. "* 



Upon reading this paffage, I recollefted hav- 

 ing been told, by the Miners at Anglezark, that 

 they ufed the Aerated Barytes in the neighbour- 

 hood to deftroy Rats, I therefore had little doubt 

 that this muft be the Spar above alluded to. 

 And though fome of its effefts appeared to be 

 exaggerated and the method of accounting for 



* Page 76. 

 R r 2 . them 



