150 BACTERIOLOGICAL EXAMINATION OF MILK. 



BiBWOGRAPHY OF COMMITTEE REPORT. 



1. Transactions A. P. H. A., VoL XXX, Part II. 

 I. Comparison of Media. 



a. Heinemann, Appendix A.* 



b. Prescott, Appendix B.* 



c. Prescott, Technology Quarterly, Vol. XVIII, No. 3, page 252. 



d. Report Boston Board of Health, 1906, page 74. 



3. Fidler and Copeland, Report Massachusetts State Board of Health, 

 1906, page 585. Muir and Ritchie, 1903, page 37. 



4. Slack, Appendix C* 



5. Hill and Ellms, Report of Brooklyn Water Supply, 1897. 



6. Hill, the Mathematics of the Bacterial Plate Count ; Paper read 

 before I^aboratory Section A. P. H. A., Sept. 30, 1907. 



7. Slack, Appendix D.* 



8. Slack, Appendix R.'-' 



9. Report Boston Board of Health, 1906, page 76. 



10. Stokes, Appendix F.* 



11. Hill and Slack, American Journal of Public Hygiene, November, 

 1904, page 237. 



12. Gorham, l,aboratory Course in Bacteriology, page 54. 



13. Method used by H. W. Hill, Minnesota State Board 'of Health 

 Laboratory. 



14. Heinemann, Appendix G.'~ 



15. Campbell, Appendix H.* 



16. Hill, Journal of Medical Research, Vol. XIII, No. 1 (New Series, 

 Vol. VIII, No. 1), pages 93-96, December, 1904. 



17. Gage, Appendix I.* 



■J ,i * * * * 



Significance of results. In the interpretation of the results 

 of the numerical determination of bacteria in milk, it must 

 be constantly borne in mind that the results indicate only con- 

 ditions at the moment the sample was taken. We are not 

 dealing with the quantitative estimate of a milk constituent 

 like fat, which is present in the same proportion in a given 

 sample at all times. It must be remembered that a bacterial 

 count is a measure of the progress of multiplication of a com- 

 plex mixture of micro-organisms, controlled by an equally 

 complex series of factors. The results at any given time 

 depend in part upon initial numbers, species, characteristics 

 of the milk, its age, the temperature at which it has been kept, 



* Reference lo Appendix of Coimniltee report, lo be found in tlie Anierjcnn Journal 

 of Public Hygiene, N. S. Vol. Ill, 19111, No. 5, pp. ,154 to 364. 



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