xiv MILK AND THE PUBLIC HEALTH 



Health Act, 1875 — Sec. 28, Public Health Acts Amendment Act, 

 1890— Section 4, Infectious Diseases Prevention Act, 1890 — Public 

 Health Acts Amendment Act, 1907 — The Sale of Foods and 

 Drugs Acts, 1875 and 1899— The Sale of Milk Regulations, 1901 

 —The Public Health (Regulations as to Food) Act, 1907— The 

 general objects of milk legislation — Legal relationship between milk 

 and infectious disease — Law as to preservatives in milk. 



CHAPTER XVIII 



The Prevention of Human Tuberculosis op Bovine Origin 321 



The difficulties in the way of the control of bovine tuberculosis — Bang's 

 method — Bang's system in the Birmingham district — Ostertag's 

 method — Vaccination against tuberculosis — The control of bovine 

 tuberculosis in the light of American experience — Manchester Milk 

 Clauses and other local Acts — Influence of these local Acts upon the 

 prevalence of tuberculous milk — Their influence upon the prevalence 

 of udder tuberculosis — Their influence upon the general purity of 

 the milk supply — Consideration of the value of the special milk 

 clauses — Methods and measures advocated for eradicating bovine 

 tuberculosis — Report of the American Veterinary Medical Associa- 

 tion Committee. 



CHAPTER XIX 



Special Methods to obtain a Purer Milk Supply 347 



Certified milk : origin, objects, nature of the control, regulations of 

 the New York Milk Commission, the extent of the movement — 

 English Milk Depots: objects, methods of working, results obtained, 

 cost, proper functions of Milk Depots — The score-card system — 

 The permit system — Municipal milk control in Wellington (New 

 Zealand). 



CHAPTER XX 



Artificial Methods for the Preservation of Milk 371 



Methods available — Refrigeration — Sterilisation — Commercial steril- 

 ised milk — Changes which occur in heated milk — Influence of 

 heating upon the dietetic and other qualities of milk — Pasteurisa- 

 tion : nature, types of pasteurisers, efficiency to kill pathogenic 

 bacteria, objections — Use of chemical preservatives — Efficiency of 

 preservatives — Amounts added and detected — Objections to their 

 use — Recommendations of the Departmental Committee — Hydrogen 



peroxide as a milk preservative — Condensed milk — Dried milk 



Reconstructed milk. 



