Explanation of Plate 6. 



STREPTOCOCCUS PYOGENES. Eosenbach. 



I. Agar streak culture, ten days at 37. 

 II. Gelatin stick culture, six days at 22. The col- 

 ony is not often found in such a vigorous state. 



III. Agar stick culture, six days at 37. Puncture 



canal. 



IV. Agar stick culture, six days at 37. Surface. 

 V. Gelatin plate, six days at 22. 



VI. Gelatin plate, six days at 22. x70. Somewhat 

 abnormal shape with ragged edges. The larger 

 colonies superficial, the smaller ones deep. 

 VII. Gelatin plate, six days at 22. x 70. More fre- 

 quent form. Upper one superficial, lower one 

 deep. 



VIII. Agar plate, eight day sat 37. x50. Larger colony 

 superficial, smaller colonies deep. 



IX. Microscopical preparation from a bouillon cul- 

 ture, two days at 37. x 700. The individual 

 cocci are usually more regularly rounded. 

 X. Microscopical preparation from an agar culture, 

 two days. Shorter chains. X 1,000. 



XI. Microscopical preparation. Called streptococcus 

 conglomeratus. Smear preparation from the 

 blood of the spleen from a case of scarlatina. 

 Copied from Kurth (Kaiserl. Gesundheits- 

 amt, Vol. VII.). 



XII. Streptococci chains, before and during division. 

 High magnifying power. 



XII. 



