JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE III, 



Illustrating Professor Lankester's Memoir on Bacterium 



rubescens. 



N .B. — The scale in the upper left-hand corner gives the amplification of 

 figs. 1 — 6 ; the scale in the lower left-hand corner refers to the re- 

 maining figures. 



Figs. 

 1. — Multilocular glceogenous spherical plastids embedded in a continuous 



jelly-like matrix. 

 2. — Homogeneous biscuit-shaped plastids, freely swimming. 

 3. — Multilocular biscuit-shaped plastids, freely swimming. The more 

 elongated specimens were motionless and are transition forms lead- 

 ing to the filamentous form of plastid. 

 4. — The maceration- breed of homogeneous biscuit-shaped plastids, com- 

 parable to B. termo. Some are in active movement. 

 5. — Rectilinear tesselate aggregate of unilocular biscuit-shaped plastids re- 

 sembling Merismopcedia. Similar sheets often attain six times the 

 linear dimensions here given, and are composed of a proportionately 

 larger number of rows of plastids. 

 6. — A plastid similar to those constituting the plate drawn in fig. 5, but 

 possessing a small eccentric loculus. Compare fig. 22 of former 

 memoir. 



Figs, 7 to 23 {excepting figs. 10 and 22) represent phases in the 

 development of the Macroplasts. 

 7. — Discoidal aggregate consisting of large glceogenous, spherical multi- 

 locular plastids. 

 8. — Detached plastid from a similar aggregate, showing its tendency to 



break up into smaller plastids. 

 9. — Macroplast with jelly-like border and closely compressed constituent 

 plastids. 

 10. — Fragment of Clathrocystis-like tesselate aggregate, built up of uni- 

 locular biscuit-shaped plastids. 

 11. — Smallest-sized macroplasts. 

 12. —Small granular macroplast. 

 13. — Macroplast with coarser granulations (new free-formed plastids) and 



jelly-like border. 

 14. — Intensely coloured homogeneous macroplast. 

 15.— Loose condition of a macroplast. The free-formed plastids (or loculi) 



are now separated by abundant interposed jelly-like matrix. 

 16. — Homogeneous macroplast. 

 17. — Finely granular macroplast. 

 18. — Finely granular macroplast of irregular shape. 

 19. — A group of small macroplasts, drawn from an actual specimen. 

 20. — Homogeneous macroplasts of brownish tint. 

 21. — Finely granular macroplast. 



22. — Fragment of a Clathrocystis-like tesselate aggregate, built up of uni- 

 locular biscuit-shaped plastids. 

 23. — Small macroplast of intense coloration. 



