vi 



PREFACE. 



Mr. Rowland Hill, to whom this volume is indebted 

 for its satisfactory appearance and clear typography. 



This Volume contains the number for the year 

 1878, its publication having been unavoidably delayed. 

 Fresh material is available for a new number and in 

 the hands of the Editor, who invites all those willing 

 and able to contribute to this Journal to lend him 

 their kind and welcome assistance. 



GUSTAV OPPERT. 



5th February 1879. 



