AZOLLA AND SALVINIA. 



565 



base of the nucleus distinctly seen, also the 

 paraphysiforra bodies, the vascular supplies 

 of the ovula, and in the right hand one the 

 disposition of the component cells of the pre- 

 viously continuous filaments. Both shew 

 the first change the occurs in the nucleus* 

 and both would have been calyptrate cap- 

 sules ; 200 times. 



PI. CXXI. f. III. Upper is another a little more advanced, burst 

 and under pressure. 



PI. CXXII. f. IV. Another of the same, the grains, (disconnect- 

 ed joints of the filaments,) have all passed 

 out by pressure, and the space between the 

 nucleus and the foramen is consequently 

 empty. In both the early development of 

 the future yellow sac is attempted to be 

 shewn. 



„ f. IV. 17. Part of a confervoid filament found about the 

 base of this pair, 550 times. 

 „ 18. 19. Grains contained in the same : in 19 these ap- 

 pear as if inclined to coalesce ; 550 times. 

 „ f. IV. 15. Fellew of the same, as usual a little more 

 advanced : in this the yellow sac was suffi- 

 ciently distinct, and the condensed points, 

 the first step in this development of the 

 lobes, had also made their appearances ; 200 

 times. 



(Development and mature state of the sac- containing capsule.) 



PI. CXXI. f. VL Pair of young capsules, filaments still protrud- 

 ing from the foramen of one ; this belongs 

 to the second kind of formation. The 

 lower one represents the development of 

 the yellow sac, and the appearance of the 

 condensed points within the nucleus above 

 the (yellow) sac. 

 „ f. IV. Another pair of about the same period, with 

 some paraphysiform bodies round the base, 



