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TO THE CAMBRIDGE EDITION 



THIS edition of the admirable work of Dr. 

 Liebig is published in compliance with the 

 wishes both of the author and of the translator, 

 and is the only American edition authorized by 

 them. It contains valuable matter which is not 

 in the English edition. 



There have been fewer deviations in the 

 body of the work from the London edition than 

 were at first contemplated. After a consider- 

 able part of that edition had been printed, it 

 was deemed advisable to introduce new matter, 

 which, without deranging the whole work, 

 could only be done by withdrawing portions 

 and substituting the new matter. Both the 

 portions withdrawn and those substituted, to- 

 gether with various corrections, and matter for 

 a* 



6692G2 



