1904] MERRIMAN: VEGETATIVE CELL DIVISION 205 
Fic. 14. A longitudinal section of a periblem cell showing a late stage in 
the spireme, where it has a vacuolar appearance with prominent connecting 
linin bridges; killed in chrom-acetic - stained with Heidenhain’s haema- 
toxylin with iron alum. X 2440 
Fic. 15. A longitudinal section of a periblem cell showing the elongation 
of the nucleus: killed in chrom-acetic; stained with eosin and Heidenhain’s 
haematoxylin with iron alum. X 2440. 
Fic. 16. Longitudinal sections of two periblem cells in the late spireme 
stage; the lower nucleus shows the appearance of hyaline caps; killed with 
chrom-acetic ; stained with eosin and Heidenhain’s haematoxylin with iron 
alum. X2440 
Fic. 17. Longitudinal section of periblem,cell showing ovoid enlargement 
of the nucleus ; killed in Flemming’s weaker solution ; stained with eosin and 
Heidenhain’s haematoxylin with iron alum. 
I . Longitudinal section of a periblem cel showing the elongated 
nucleus = the breaking of the spireme thread, also the aggregation of cyto- 
plasm at the poles; killed in picro-sublimate; stained with Heidenhain’s hae- 
spimelate and iron alum in combination with eosin. 2440. 
G. 19. Longitudinal section of a periblem cell with the cell surface in 
a: showing the elongated shape of the nucleus and its relation to the aggre- 
gations of cytoplasm; killed in picro-sublimate ; stained with Heidenhain’s 
haematoxylin with iron alum in combination with eosin. X 2440 
FiG. 20, The same cell with the central portion in focus. 
Fic. 21. Longitudinal section of a periblem showing the beginning of the 
dissolution of the nuclear membrane; killed in chrom-acetic ; stained with 
Heidenhain’s haematoxylin in combination with orange G. 440. 
Fics. 22-23. Longitudinal section of a periblem cell showing the lower 
and upper part of the cell; killed in chrom-acetic; stained with safranin, 
tone violet, and orange G. 
. 24. Longitudinal section of a dermatogen cell showing the pete cap 
a. killed in chrom-acetic ; stained with Heidenhain’s haematoxy- 
lin in eure with eosin. X 24 
25. Longitudinal section ay a « periblods cell showing the fusion 
of th paietate. from the cytoplasm with the nuclear reticulum ; killed 
in Flemming’s weaker solution 24 hours; stained with Heidenhain’s haema- 
toxylin in combination with eosin, 2440. 
Fic. 26. Longitudinal section of two periblem cells after the spireme has 
broken up into chromosomes, showing the disappearance of the nuclear mem- 
brane and the ingrowing of the fibrillations of the cytoplasm ; killed in 
Flemming’s weaker solution twenty-four hours ; stained with Heidenhain’s 
srs with iron alum. X 2440. 
27. Longitudinal section of a periblem cell showing an early stage in 
the eae of the achromatic figure; killed in Flemming’s weaker solu- 
tion twenty-four hours ; stained with Heidenhain’s haematoxylin with iron 
alum. X 2440 
