22 
A SECOXD EDITION. 
The first edition of this bulletin, which was issued January, 1908, 
has been of great value to health officers and others interested in 
improved milk supplies, as is shown by the enormous and constant 
demand throughout the world for copies. It was abstracted by 
Mr. Xathan Straus, and the abstracts were generously distributed 
by him throughout Europe in connection with his propaganda for 
safe milk. 
The first edition has long since been exhausted, and it therefore 
becomes necessary to publish a second edition. On account of the 
short time since the first edition appeared and the character of some 
of the data relating to the investigation, especially that contained in 
the statistical tables, it has been impracticable to include the corre- 
sponding statistics for the year 1908. The limitations of the volume 
have prevented the inclusion of chapters relating to certain milk 
products, although discussion dealing with butter, dried milk, pre- 
pared milk, and milk substitutes would be of value. It is expected 
that these subjects will be given consideration in later publications. 
Important chapters added in this edition include a discussion of 
the relationship of the tuberculous cow to public health, by Dr. E. C. 
Schroeder, of the Bureau of Animal Industry. In this article. 
Doctor Schroeder invites attention to the manner in which tubercle 
bacilli are expelled by tuberculous cattle, the technique used in 
demonstrating bovine tubercle bacilli, the ways in which tubercle 
bacilli expelled by tuberculous cows get into milk, and the dangers 
involved therein. 
In a chapter on the thermal death point of pathogenic micro-organ- 
isms in milk, Surg. M. J. Kosenau concludes that the heating of milk 
to 60° C. for twenty minutes is sufficient to destroy the tubercle 
bacillus, the diphtheria bacillus, the cholera vibrio, the dysentery 
bacillus, and the Micrococcus melitensis. He also refers to recently 
enacted laws relating to pasteurization, discusses home pasteuriza- 
tion, and gives directions for its employment. 
Passed Asst. Surg. John F. Anderson, in a new chapter, deals with 
the relative proportion of bacteria in top milk and bottom milk, and 
its bearing on infant feeding. 
Dr. H. W. Wiley, Chief of the Bureau of Chemistry of the Depart- 
ment of Agriculture, has also contributetd an additional chapter on 
the national inspection of milk. 
It is a pleasure to acknowledge the interest shown in this publica- 
tion, as well as again express appreciation to Doctor Woodward 
and the officers of the Department of Agriculture for their coopera- 
tion in the preparation of this work. 
