SALVINIA 



523 



$. Long section of the same. 



7, 7. Central nucleus i e yellow sac and its incrustation separated, 

 the three teeth of this shewn, sometimes these are irregular, 

 incrusted, not organic. 



8. Upper end of incrustation removed to shew the upper surface 

 of the yellow sac, which becomes depressed when dry, the tri- 

 facial line hardly seen. 



Fig. III. — 1. Represents an imbedding mass viewed superficially 



*• 



2. Represents part of the same under pressure, shewing that it 

 is not organic cellular 1-16, it also shews the contents now of 

 the trifacial. 



3, 3, 3. Younger secondary capsules, illustrating the formation 

 of the imbedding masses from parietal growths or deposits, 

 each protuberance either enclosing several cells or one only. 

 They subsequently meet in the centre and coalesce. 



They are not organic cells, presenting no membrane, and 

 being sometimes elastic underpressure, just as mucilagino-gra- 

 nular fluid may be. In the early semifluid state it is very deep- 

 ly browned by Iodine. 



Salvinia, PI. CXXVIII. (continued.) 



.Fig 1 — 1. One of the oblong bodies, surface view. \. 



2. The same centre in focus, th« chief change is in the great size 

 of the central cell, the diminution of the grumous nucleus, 

 peripherial cells are still visible. 



3. Attaching trifacial face of sac central. 



4. The same, centre in focus. 



5. Grume escaping on puncture or pressure. This shews what I 

 take to be an instance of the spores just separating (seen only 

 once.) 1-16. 



6. Another part of grumous contents; one of the green nuclei, so 

 common in earlier stages, now rare is seen. The spores are 

 frequent but not very many, generally occuring as it were im- 

 bedded isolatedly. 1-16. 



7. Portion of a grume, do. J, shews three cells, membrane not 

 well defined, without nuclei, or lines of division. 



Fig. II. — Germinating body, J M. 



