Exercise VI STUDIES IN MICROBIOLOGY (1) 37 



young culture of 5. marcescens in wide tube (20 ml) small potato 



old culture of S. marcescens in 250-ml Erlenmeyer paper towels 



flask (50 ml) 4 volumeters 



4 dropping bottles of 3% hydrogen peroxide 



2 dropping bottles of 10% hydroxylamine, neu- Per laboratory 



tralized water baths at 37°C with rack accommodating wide 



dropping bottle of horse blood diluted 1;20 in tube 



0.85% sodium chloride provision for aeration at water baths 



