vi EXPERIMENTAL DAIRY BACTERIOLOGY 



CHAPTER PAGES 



Making of stained preparations 44 



Gram's stain 47 



Flagella stain 47 



Capsule stain 48 



Spore stain 48 



Examination of living bacteria 49 



Hanging block 51 



Measuring bacteria 51 



III. CONTAMINATION OF MILK 53-63 



Contamination from barn air 54 



Contamination from coat of animal 56 



Contamination from manure 57 



Contamination from hair 58 



Contamination from interior of udder 58 



Contamination from utensils 60 



Washing utensils 63 



Plan for the production of sanitary milk . 63 



IV. MILK FERMENTATIONS 64-85 



Preliminary cultivation 65 



Primary tests for identification of species 66 



Action on carbohydrates 67 



Action on nitrates 70 



Formation of indol 72 



Relation to oxygen 72 



Relation to temperature 73 



Chromogenesis 74 



Action on milk 74 



Acid fermentation 76 



Digesting and sweet-curdling fermentation . . . . . 77 



Alcoholic fermentation 78 



Ropy fermentation 79 



Bitter fermentation 80 



Cycle of fermentations in milk 80 



Butyric -acid fermentation 81 



