128 



GENERAL MICROBIOLOGY 



Method. 1. Make an agar slant culture of each organism 

 and incubate each at its optimum temperature. (Instructor 

 will designate the optimum temperature of each.) 



11 



FIG. 38. Comparative Sizes of Bacteria. 



1, Micrococcus progrediens, 0.15^,' 2, Micrococcus urea;, 1-1.5^; 

 3, Sarcina maxima, 4^; 4, Thiophysavolutans (sulphur bacteria), 

 7-18^; 5, influenza bacillus, 4.2X0.4/x; 6, methane bacillus, 

 5X0.4/*; 7, Urobacillus dudauxii (Miquel), 2-10X0.6-0.8^; 

 8, Bacillus nitri (Ambroz), 3-8X2-3^; 9, Beggialoa alba 

 (sulphur bacteria), 2. 9-5. 8 X 2. 8-2. 9/*; 10, Chromatium okenii, 

 (sulphur bacteria), 10-15X5/*; 11, Beggiatoa mirabilis (sul- 

 phur bacteria), 20-25 X40-50/X. (From Fuhrmann's Tech- 

 nische Mykologie.) 



2. Draw and describe twenty-four-hour old agar slant 

 cultures, then examine microscopically in hanging drop to 

 determine the morphology, size, grouping or arrangement, 



