LIST OF PLATES. XXV 



LIST OF PLATES. 



PLATE I. 



Illustrating the Report of the Committee for constructing and issuing Practical 

 Standards for use in Electrical Measurements. 



PLATES II., IIL, IV., Ain) V. 



illustrating the Report of the Committee for investigating the Microscopical 

 Structure of the Older Rocks of Anglesey. 



