1897 ] LIFE HISTORY OF LILIUM PHILADELPHICUM 449 
In the daughter skein stage there are two centrospheres at each 
pole, which are often quite distinct and can easily be differenti- 
ated from the micronucleoli. 
THE UNIVERSITY OF CHICAGO. 
EXPLANATION OF PLATES XXXVII-XXXIX. 
| All the figures are reduced to three-eighths of their original size. The 
a magnification given with each figure is the original magnification of the draw- 
ings before reduction. 
Fic. 1. Part of a young nucellus showing the archesporium developing 
ee directly into a fertile macrospore. Anilin-safranin, gentian-violet. < 1200. 
a Fic. 1a. A small part of the chromatin network showing a single row of 
chromatin granules on the linin threads. X 2250. 
Fig. 2. Nucleus a little older than in fg. z. The chromatin network 
seems to be in close connection with the nucleoli. Chromatin granules con- 
siderably larger. Anilin-safranin, gentian-violet. >< 1200. 
: a Fig. 2a. Linin thread with chromatin granules. 
E Fic. 3. Nucleolus; the usual appearance before the division of the chro- - 
matin granules. Delafield’s haematoxylin, erythrosin. 2250. 
2 Fic. 4. Section of nucleus at the stage when the integuments are just 
beginning to appear. The linin thread is very thick and the chromatin 
granules are dividing transversely. There were four large nucleoli in this 
nucleus. Delafield’s haematoxylin, sree X 1200. 
Fig. 4a. Small piece of the linin thread ing g t of the chro- 
Matin granules. X 2250. 
Fig. 5. An enormous nucleolus, with large central vacuole, which has a 
granular structure. Just before division of the chromatin granules. Anilin- 
safranin, gentian-violet. < 2250. 
Fic. 6. Nucleolus about the same stage as fig. 5, witha depression or dent 
_ none side. Anilin-safranin, gentian-violet. 2250. 
Fic. 7 Nucleolus with several vacuoles; same stage as jigs. 6 and Fx: 
in, gentian-violet. 2250. 
Fie. 8. Macrospore with nucleus containing double chromatin pan pro- 
duced by longitudinal splitting. Two centrospheres on one side of the 
_fucleus. The cytoplasm contains peculiar soammas: strands. Delafield’s 
haematoxylin, erythrosin. 1200. 
_ Fie. 8a. Section of the same nucleus showing another nucleolus. x —s : 
hic 84. Short piece of double chromatin band. X 2250. 
Fie. 8¢. Double chromatin band a little wider than jig. 86. X 2250. 
