DEDICATION. XX111 



branches of medicine; and his intimate ac- 

 quaintance with the German language, all 

 these, taken together, are the best securities, 

 that the translation is such as to convey the 

 exact sense of the original ; securities, such as 

 are not often united in the same individual. 



It is my intention to follow this second part 

 with a third, the completion of which, however, 

 cannot be looked for before the lapse of two 

 years. This third part will contain an investi- 

 gation of the food of man and animals, the an- 

 alysis of all articles of diet, and the study of 

 the changes which the raw food undergoes in 

 its preparation ; as, for example, in fermenta- 

 tion (bread), baking, roasting, boiling, &c. 

 Already, it is true, many analyses have been 

 made for the proposed work; but the number 

 of objects of investigation is exceedingly large, 

 and in order to determine with accuracy the 

 absolute value of seed, or of flour, or of a spe- 

 cies of fodder, &c., as food, the ultimate analy- 

 sis alone is not sufficient ; there are required 

 comparative investigations, which present very 

 great difficulties. 



DR. JUSTUS LIEBIG. 

 GIESSEN, 3d June, 1842. 



