TABLE OF CONTENTS 



Introduction ■ ■ 4 



Routine Milk Analyses 4 



Verification and Research Methods : •^ 



Methods Described 5 



Collection of Samples for Bacteriological Counts, 6 



(a) Macroscopic Colony Count (Petri plate method) 7 



Composition of Medium ' 



Reaction 8 



Adjustment of Reaction 9 



Method of Preparing Agar .... 9 



Procedure No. 1 9 



Procedure No. 2 10 



Plating 11 



Incubation ... 12 



Counting Plates 12 



Common Sources of Errors in Counts 12 



Reports 13 



(b) Microscopic Count of Bacteria (Breed method) 14 



Apparatus Required 14 



Preparation of Films of Dried Milk IS 



Standardization of the Microscope 15 



Counting and Grading Milk 16 



Common Sources of Error in Counts. 17 



Reports 18 



(c) Microscopic Colony Count (Frost method) .... 18 



(d) Verification and Research Methods 19 



(e) Sediment Test 20 



Technique 20 



Method of Recording Results 20 



Preparation of Disks for Filing 21 



Reports 21 



(f) Detection of Specific Pathogens in Milk 21 



Summary 22 



