Explanation of Plate 27. 



BACTERIUM JANTHINUM. Zopf. 



I. Gelatin stick culture, ten days at ordinary tem- 

 perature. 



II. Agar streak culture, six days at ordinary tempera- 

 ture. The white borders at the sides also 

 become violet after prolonged standing. 



III. Agar stick culture, seven days at ordinary tem- 



perature. Puncture canal. 



IV. Agar stick culture, seven days at ordinary tem- 



perature. Surface. 



V. Agar plate culture (x60), four days at ordinary 

 temperature. Superficial and deep colony. 

 Within the former the original colony is still 

 visible. 



VI. Agar plate culture, eight days at ordinary tern 

 perature. Natural size. The colonies often 

 take on a dark violet color. 



VII. Gelatin plate culture, six days at ordinary tem- 

 perature. Natural size. The blue zones are 

 not always so deeply colored. 



VIII. Gelatin plate culture, six days at ordinary tem- 

 perature, x 60. The smaller colony is near 

 the surface, the larger one upon the surface. 

 IX. Microscopical preparation, from a five days' agar 



culture, x 700. 



X. Potato culture, six days at ordinary temperature. 

 XI. Bacteria with flagella. x 1,000. Loffler's stain. 

 XII. Bacteria with flagella, from a culture obtained 

 from Sweden, xl ; 000. 



XI XII. 



2? 



