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 vaccinal. 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. — Zoogloea-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. — Spirochmte 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. 



