x PREFACE. 



Among English works he would especially mention 

 the assistance he has derived from the writings of 

 Mr E. Warington, F.E.S., Professor S. W. Johnson, 

 Professor Arrnsby, the late Dr Augustus Voelcker, 

 and others. He would also tender his acknowledg- 

 ments to the new edition of Stephens' ' Book of the 

 Farm/ and he has to thank its editor, his friend Mr 

 James Macdonald, Secretary to the Highland and 

 Agricultural Society of Scotland, for having read 

 parts of his proof-sheets. 



It is also his pleasing duty to thank his friends 

 Dr Bernard Dyer, Hon. Secretary of the Society 

 of Public Analysts; Dr A. P. Aitken, Chemist to the 

 Highland and Agricultural Society of Scotland ; Pro- 

 fessor Douglas Gilchrist of Bangor ; Mr F. J. Cooke, 

 late of Flitcham ; Mr Hermann Yoss of London ; and 

 Professor Wright of Glasgow, for having assisted him 

 in the revision of proof-sheets. 



ANALYTICAL LABORATORY, 



128 WELLINGTON STREET, GLASGOW, 



January 1894. 



