*' Dr. Webster has rendered an important service to the agricul- 

 tural community, by presentinor an edition of this now well known 

 and highly esteemed work. Professor Liebig has for some time 

 been known as one of the most eminent chemists of Europe, and the 

 publication of this work in England has excited general and unqual- 

 ified approbation. Almost all the scientific and literary periodicals 

 have been loud in its praise, and all concur in the opinion, that a 

 new era in agriculture must date from its appearance. The present 

 edition has been greatly increased in value and utility by the addi- 

 tions which it has received from the American editor. The Notes 

 and Appendix contain much important information for the agricul- 

 turist, and the explanations which have been added of chemical 

 terms, render it intelligible to all. It should be in the hands of every 

 farmer. The typography and general appearance of the volume is 

 such as might be expected from the University Press." — Christian 

 Examiner, July, 1841. 



*' In the present work, Dr. L. has pointed out the path to 

 be pursued, and has amply vindicated the claim of science to 

 be considered the best guide, by correcting the erroneous 

 views hitherto prevailing, of the sources whence plants derive 

 their nourishment, by developing the true causes of fertility 

 in soils, and finally, by establishing, on a firm basis, the true 

 doctrine of manures." — Quarterly Revieiu, March, 1842. 



NOTICE OF PART II. 

 ANIMAL CHEMISTRY. 



" While we have given but a very imperfect sketch of this origi- 

 nal and profound work, we have endeavored to convey to the read- 

 er some notion of the rich store of interesting matter which it con- 

 tains. The chemist, the physiologist, the medical man, and the 

 agriculturist, will all find in this volume many new ideas and many 

 useful practical remarks. It is the first specimen of what modern 

 organic chemistry is capable of doing for physiology; and we have 

 no doubt that, from its appearance, physiology will date a new era 

 in her advance. We have reason to know that the work, when in 

 progress, at all events the more important parts of it, were submit- 

 ted to Mailer of Berlin, Tiedemann of Heidelberg, and Wagner of 

 Gottingen, the most distinguished physiologists of Germany ; and 

 without inferring that these gentlemen are in any way pledged to 

 the author's opinions, we may confidently state that there is but one 

 feeling among them as to t*he vast importance of Chemistry to Phys- 

 iology at the present period ; and that they are much gratified to 

 see the subject in such able hands." — Quarterly Revieto, 



