vi PEEFACE. 



pages are of too varied a nature to admit of 

 acknowledgment, special reference may be made 

 to Dr Heiden's ' Diingerlehre/ Dr Emil von 

 Wolff's excellent little book, ' Die praktische 

 Diingerlehre/ Storer's ' Agricultural Chemistry/ 

 Stephens' ' Book of the Farm/ the Rothamsted 

 Experiments, and lastly, to Mr Warington's 

 excellent little handbook on c The Chemistry of 

 the Farm/ to the publishers of which Messrs 

 Vinton & Co., Limited the author is indebted 

 for permission to reprint in the Appendix 

 several of its valuable tables. 



