MILK 



AND ITS HYGIENIC RELATIONS 



CHAPTER I 



AUTHOR'S INTRODUCTION 



THE hygienic aspect of the milk supply of this country has been 

 before the public for some years and has been much discussed. 



Although at first sight the problem may seem to be a simple 

 one, its study opens up such a variety of intricate questions, and 

 the number of issues arising is so great, that it is difficult to form 

 a well-balanced judgment. 



The position is rendered more difficult by the fact that most of 

 the research work which has been undertaken in order to elucidate 

 the problems of milk, is to be found in foreign periodicals, of 

 which only a few are in the English language, the majority being 

 in either French or German. Moreover, many of these periodicals 

 are difficult of access to readers in this country. 



As a result it has been almost impossible even for the scientific 

 worker to obtain a clear view of the position without great ex- 

 penditure of both time and labour. 



The primary aim of this book is to present a survey of the 

 existing knowledge upon such aspects of the milk question as 

 hitherto has been inaccessible or difficult to obtain by most of 

 those desiring it. 



The material which might properly be included under the 

 title of the book is so voluminous as to be unwieldy. 

 Attention has therefore been concentrated mainly upon those 

 branches of the subject which have received less attention 

 from other authors. Even with this object in view it was by no 

 means easy to decide which of the numerous questions should be 

 included in the survey, but, so far as possible, only material directly 

 related to the hygienic or nutritional aspects of milk has been 



