gated this field, and has, based upon such investigation, determined 

 the limits of the composition of a normal food. "Without this, the 

 position of an expert before a court of justice would be untenable. 



The examination of the milk differs according to the question 

 which is to be decided. It may be made to ascertain the relative 

 quantities of the normal constituents of milk, or to determine the 

 admixture and nature of foreign substances which may, or may not, 

 be dangerous to the health of the consumers. 



Each chemical examination is preceded by an examination with 

 the senses — eye, smell and taste. Hereby many admixtures and 

 qualities of milk may be directly ascertained, which, for the fol- 

 lowing chemical examination, may not only furnish hints, but 

 which may serve to corroborate the results obtained by it. 



The physiological part of the milk question has been included 

 for the reason that in cases before the courts such questions fre- 

 quently arise, and because the knowledge of them will aid in the 

 formation of a more correct opinion. 



To facilitate the examination of milk and milk products, a num- 

 ber of plates from microscopic objects have been introduced into 

 the text. 



The chemical and physical analysis of infants' milk-foods and 

 their hygienic value, has in no previous work been treated as 

 thoroughly. The method of analysis given is based upon the exact 

 investigations made by Dr. P. Eadenhausen and the author, and is 

 given in this work in an improved shape. The author desires to 

 recommend to the consideration of the medical profession the 

 chapter entitled, "Hygienic demands upon the manufacturers of 

 infants' milk-foods." Humanity demands that we know and ex- 

 amine which foods should be recommended and can be relied upon. 

 Much hardship and sickness of mankind can be prevented, if by 

 rational food the organism, especially of infants, be strengthened. 

 The author sincerely desires that the contents of this book will not 

 fail to improve our knowledge of food hygiene, and thus fulfil the 

 expectations,, with which it has been written. 



