AND POLLEN IN SISYRINCHIUM. ` 117 
are dion contains a grumous mass, FH detached, particu- 
larly by slight pressure from the cells. This mass presents 
` faint traces of division into cells, the whole of which are oc- 
cupied by grumous matter. Fig. 
Perianth 1i line long. Cellularity of the mass more 
developed, the cells are entirely occupied by grumous mat- 
‘ter, and are surrounded, as indeed in the former case, by 
_ grumous matter, but the mass can scarcely be said to be en- 
closed as yet in a proper membrane. Fig. ; 
Perianth 12 line long. The mass is now orange-yellow 
externally, where alone it is grumous; traces of an enclosing 
cellular membrane are visible, but indistinctly. The cells 
above alluded to have become separated; they consist of a 
hyaline rather thick-looking membrane, enclosing a grumous 
nucleus generally of a globular form. The membrane itself is 
generally globular, but often somewhat attenuated at either 
end. Fig. 3. 
Perianth 2 lines long. The mass is now very iiis 
detached, and is enveloped in a membrane which presents - 
indication of cellularity, and of the cells being filled with 
orange grumous matter. The cells remain the same, so far 
as the outer membrane is concerned, but the nucleus has 
become divided into 4, occasionally 3 portions; which, how- 
ever, are not separated. The space is intermixed with much 
grumous orange matter, especially towards the circumference 
ofthe mass. The outer cell is often elongated, and has, I 
think, a tendency to elongation from immersion in water. 
ig. 4. 
- A little later, and the divisions of the originally simple 
nucleus are more distinct, but no displacement has occurred. ` 
Perianth 23 lines long. The mass remains much the 
same, but the cells have increased in size, and the divisions 
of the nucleus have undergone in many cases separation, 
they are easily detached from the cell. Each division, now 
a young grain of pollen, is contained in a distinct cell, which, 
however, does not separate with the grain, but remains 
- attached to the interior of the original cell. The masses 
are oblong-ovate, flattened along their contiguous faces, and 
