JOURNAL OF MICROSCOPICAL SCIENCE. 



DESCRIPTION OF PLATE XIV., 

 Illustrating Dr. D'Alquen's paper on the Structure of Oscillatoria. 



Fig. 



1. — Portion of a filament of Oscillatoria contexta, showing the striated 



proper cell-membrane. 

 2. — A detached empty piece of this cell-membrane. 

 3. — Portion of filament treated with iodine. 



a. Entire portion. 



h. Proper cell-membrane slightly affected by the reagent. 



c. The plain unstriated cellnlose sheath or tnbe. 



d. Single joint on end. 



4. — Portion of filament treated by weak syrup. 

 5, — Ditto by a strong solution of chloride of calcium. 

 6. — Ditto by a weak ditto. 



7. — Ideal section of a filament, showing the concentric arrangement of its 

 different tissues. 



a. Vertical section. 



b. Horizontal section. 



c. Solid axis. 



d. Layer of protoplasm coloured by chlorophyll. 



e. Proper cell-membrane. 



8. — Portion of filament, displaying the manner in which the cell-contents 

 are sometimes observed to separate while imder the action of iodine. 

 9. — a. Portion of filament, 



b. The same as seen on end, having the appearance of a lenticular 

 disk. 

 10. — Portion of filament after desiccation and treatment by iodine, show- 

 ing the shrunken axis of the filament in the form of a gi'een thread. 

 11. — Ditto not dried, showing this thread between the separated portions 



of the filament. 

 12, 13. — Filaments with modified cells representing gonidia. 

 14. — A new species of Oscillatoria, having its cells not coloured by 



chlorophyll. 

 15. — The same, with some of its cells filled out. 



Illustrating Dr. Lankester's paper on Fungi in drinking water. 



16. — Mycelium of Fungus. «, enlargements seen on larger branches. 



17. — ^Particles passing through the branches of the Mycelium. 



18. — Spore case of the same Fungus. 



19. — Mycelium of a Fungus. /', moving particles. 



