PLATE V. 



From " Microscopical Journal'' 



FIG. 1. Micrococcus prodigiosus (Monas prodigiosa, Ehr.). Spherical 

 bacteria of the red pigment, aggregated in pairs and in fours ; the other 

 pigment bacteria are not distinguishable with the microscope from this 

 one. 



FIG. 2. Micrococcus vaccince. Spherical bacteria, from pock-lymph in 

 a state of growth, aggregated in short four to eight-jointed straight or 

 bent chains, and forming also irregular cell-masses. 



FIG. 3. Zoogloea-form of micrococcus, pellicles or mucous strata 

 characterized by granule-like closely set spherules. 



FIG. 4. Rosary chain (Torula-form) of Micrococcus urece, from the 

 urine. 



FIG. 5. Rosary-chain and yeast-like cell-masses from the white de- 

 posit of a solution of sugar of milk which had become sour. 



FIG. 6. Saccharomyces glutinis ( Cryptococcus glutinis, Fersen.), a pullu- 

 lating yeast which forms beautiful rose-colored patches on cooked 

 potatoes. 



FIG. 7. Sarcina spec,* from the blood of a healthy man,** from the 

 surface of a hen's egg grown over with Micrococcus luteus, forming yel- 

 low patches. 



FIG. 8. Bacterium termo, free motile form. 



FIG. 9. Zooglcea-form of Bacterium termo. 



FIG. 10. Bacterium-pellicle, formed by rod-shaped bacteria arranged 

 one against the other in a linear fashion, from the surface of sour beer. 



FIG. 11. Bacterium lineola, free motile form. 



FIG. 12. Zoogloea-form of B. lineola. 



FIG. 13. Motile filamentous Bacteria, with a spherical, or elliptical 

 highly refringent " head," perhaps developed from gonidia. 



FIG. 14. Bacillus subtilis, short cylinders and longer, very flexible 

 motile filaments, some of which are in process of division. 



FIG. 15. Bacillus ulna, single segments and longer threads, some 

 breaking up into segments. 



FIG. 16. Vibrio rugula, single or in process of division. 



FIG. 17. Vibrio serpens, longer or shorter threads, some dividing into 

 bits, at * two threads entwined. 



FIG. 18. " Swarm " of V. serpens, the threads felted. 



FIG. 19. Spirillum tenue, single and felted into " swarms." 



FIG. 20. Spirillum undula. 



FIG. 21. Spirillum volutans* two spirals twisted around one another. 



FIG. 22. Spirochcete plicatilis. 



All the figures were drawn by Dr. Ferdinand Cohn with the immersion 

 lens No. IX. of Hartnack Ocular III., representing a magnifying power 

 of 650 diameters. 



