JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XX, 



Illustrating Mr. JeflFrey Bell's Account of Recent Re- 

 searches into the History of Bacteria, made by and 

 under the direction of Professor Cohn. 



Tig. 1. — Ascococctis Billrothii, large knob-like cell-families, aurrounded 

 by smaller ones, and embedded in Microcococcus. 



Fig. 2. — Myconostoc gregarium : Gelatinous spheroids, in ■which are 

 fibres irregularly placed and rolled together. «, b. Single spheroids. 



c. Division of a spheroid, commencing by the separation of the fibres. 



d. a large coil of fibres in the very act of division, e. Fibres separated 

 from one another by the breaking up of the gelatinous envelope, f. 

 Fibres in ring-shaped pieces, x 600. 



Fig. 3. — Streptothrix Foersteri ; branched, and screw-form fibres from a 

 tallowy mass, taken from the lachrymal canal of a human subject, a. 

 Fibres with which are embedded Micrococci ; the rest were isolated by the 

 separation of the Micrococci, b. A thicker mycelium-like fibre. X 600. 



Fig. 4. — Cladothrix dichotoma. Dichotomous fibres forming white mucous 

 masses on the surface of putrefying fluids, x 600. a. The false dichotomy 

 is clear. X 600. 



Fig. 5. — Bacillus anthracis : Bacilli from the blood of a cow that had died 

 of splenic fever, examined after death. X 600. 



Fig. 6. — Bacillus subtilis. a. Bacterian fibres from an extract of rennet, 

 in lively movement ; b, with spores; d, spores with short fibres (? budding 

 spores). 



Fig. 7. — B. subtilis. '^Acitxi'SiD. fibres from a solution of boiled peas in 

 which butyric fermentation had begun ; the spores in a row. X 600. 



Fig. 8. — Micrococci with embedded Bacillus-spores. 



Fig. 9. — Micrococcus Bombycis : from the gastric fluid of a living silkworm, 

 affected, with the disease (flaccidezza) ; oval cells arranged in rows, either 

 in pairs or in chains of varying length. 



Fig. 10. — Clathrocytis roseo-persicina : a net-like cell family. 



Fig. 11. — Monas Warmingiij motile Monads with flagellum : in * the 

 division is just beginning, in ** it has gone farther. X 600. 



Fig. 12. — Mo7ias Okenii .-^actively motile monads ; and division beginning. 

 X 600. 



