VIU PREFACE 



viding the average intelligent citizen with some 

 statement of the question which can be readily under- 

 stood and appreciated. To provide such a state- 

 ment is the very modest aim of this volume. 



By way of assurance to that public which I thus 

 venture to address, I desire to repeat here a statement 

 which I have made in almost every one of my lectiu-es 

 upon the milk question; namely, that there are no 

 mysteries in the great problem of the relation of the 

 public milk supply to the public health which need 

 frighten away any intelligent layman. There are 

 mysteries, unquestionably, many wonderful phe- 

 nomena, which the physiologist, the pathologist, and 

 the bacteriologist are as unable to explain as the 

 humblest layman; there are also many means of 

 investigation which require scientific and special 

 training. The results of such investigation, however, 

 can be so stated, I believe, that any reader of average 

 intelligence can understand them. The social and 

 economic aspects, of the problem belong to general 

 civic knowledge, not wholly nor mainly to the medical 

 profession. 



In connection with the much-disputed subject of 

 pasteurization, I have found it necessary to modify 

 certain statements made in an earlier work. The 

 Bitter Cry of the Children. In that work I ex- 

 pressed the conviction that the pasteurization of milk 

 is "a grave mistake." I am still of that opinion in 



