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Courtesy of Dr. M. A. Dawson 



MUCOID, SMOOTH, AND ROUGH PHASES OF PNEUMOCOCCUS 

 a. Mucoid colonies ; twenty-four hours on blood agar. X 32. b. Smooth 

 colonies ; twenty-four hours on blood agar. X 32. c. Rough colonies ; 

 twenty-four hours on blood agar. X 32. d. Smooth colony with Rough 

 "outbursts"; nine daj-s on blood agar. X 32. e. Mucoid, Smooth, and 

 Rougli colonies ; sixteen hours on blood agar. The Smooth colony shows 

 a fine granulation or stippling. X 32. f. Mucoid organisms from 

 twenty-four-hour colony on blood agar. Hiss capsule stain. X 1350. 

 g. Smooth organisms from twenty-four-hour colony on blood agar. 

 Gram stain. X 1350. h. Rough organisms from eighteen-hour colony 

 on blood agar. Gram stain. X 1350. 



