CHAPTER XIV 



LABORATORY WORK IN DAIRY BACTERIOLOGY* 



By Professor H. W. Conn 



THE directions for these experiments are given in sufficient 

 detail, so that anyone with a fair knowledge of laboratory- 

 methods can follow them without other instruction. The 

 private student of dairying may, therefore, carry out this 

 laboratory course by himself, although it will take more time in this 

 case than if adequate personal instruction were obtained. 



Special emphasis should be placed upon the necessity of care- 

 fully labeling every culture made and recording in a note book 

 each experiment, its purpose and results. 



PRACTICAL WORK.f 



I. Washing Glassware. — All glassware used in bacterio- 

 logical work must be thoroughly washed. No special directions need 



*The following pages, containing practical experiments to be performed in the labor- 

 atory, are taken by the kind permission of Prof. Conn from his Practical Dairy Bacterio- 

 logy, published by Orange Judd Co., New York. 



1 The following laboratory manuals may be found useful as books of reference : 

 Moore. Laboratory Directions for Beginners in Bacteriology. Ginn & Co., 1900. 

 Frost. A Laboratory Guide in Elementary Bacteriology. The Macmillan Co., 1903, 

 Gorham. A Laboratory Course in Bacteriology. W. B. Saunders, 1901. 

 Van Slyke. Methods of Testing Milk and Its Products. Orange Judd Pub. Co., 

 1906. Bacteriology Of Milk, Swithinbank and Newman, E. P. Dutton & Co., N. Y., is 

 the most elaborate and complete work on the subject, containing detailed description 

 and beautiful plates of bacteria in milk. — K. W. 



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