( 300 ) 



IS a trapp, which, in refped to Its confiit- 

 cnce, and the feltfpars it contains, extreme- 

 ly refembles that of No. II. 



This ftone puts in motion the magnetic 

 needle at the diftance of fcarcely two lines ; 

 and may ferve for a touchftone ; a quahty 

 remarked by Cronftedt in the Swedilh 

 trapps. 



REFLEC 



