204 BOTANICAL GAZETTE : [MARCH 
(weaker solution); stained with iron alum and Heidenhain’s haematoxylin. 
2440. 
FiG 2. Cross section of meristem nucleus where the spireme is first 
becoming evident; cell killed six hours in Flemming (weaker solution); 
stained with iron alum, eosin, and Heidenhain’s haematoxylin. 2440. 
Fic. 3. Longitudinal section of periblem cell showing quadripartite 
structure of the early spireme; Flemming twenty-four hours; iron alum an 
Heidenhain’s haematoxylin. x 2440. 
Fic. 4. Longitudinal sections of two dermatogen cells showing the early 
spireme; fixed in chrom-acetic; stained with eosin, iron alum, and Heiden- 
hain’s haematoxylin. X 2440. 
Fig. 5. Longitudinal section of a periblem cell showing the quadripartite 
structure of the early spireme; killed in Flemming’s weaker solution twenty- 
four hours; stained with iron alum and Heidenhain’s haematoxylin. X 2440. 
Fig. 6, Longitudinal section of two periblem cells showing quadripartite 
structure of early spireme; killed in Flemming’s weaker solution; the upper 
cell showing the withdrawal of the cytoplasm from the poles of the nucleus, 
giving the appearance of hyaline caps; stained with iron alum and Heiden- 
hain’s _Sowenet X 2440. 
1G. 7. Cross section of periblem cell showing the quadripartite structure 
of the spireme; killed in Flemming’s weaker solution six hours; stained 
with iron alum and Heidenhain’s haematoxylin. X 2440. 
G. 8. Longitudinal section of a periblem cell showing the quadripartite 
structure of the spireme in a somewhat later stage; killed with chrom-acetic; 
stained with orange G and Heidenhain’s haematoxylin with iron alum. 
X 2440 
Fig. 9. Cross section of periblem cell showing a later stage of the spireme 
and the nucleus beginning to elongate; killed with chrom-acetic and stained 
with orange G in combination with Heidenhain’s haematoxylin and iron alum. 
X 2440. 
Fic. to. Longitudinal section of a periblem cell with the spireme of 
smooth contour; killed in chrom-acetic; stained with safranin, gentian 
violet, and orange G. X 2440 
Figs. 11-12. A longitudinal section of a periblem cell drawn at upper and 
lower focus, showing the appearance of hyaline polar caps and ingrowing cyto 
plasmic fibrillations ; killed with chrom-acetic; stained with safranin and 
gentian violet. X 1750. 
Fic. 13. Longitudinal section of a periblem cell ; the cell is sectioned in 
such manner as to give at the same — an aot and surface view of the spi- 
reme thread; the end view sh structure, while the surface 
view shows the fusion of the component granules into a continuous thread ; 
the elongation of the nucleus can also be noted here; killed with Flemming’s 
weaker solution; stained with iron alum and Heidenhain’s haematoxylin. 
*% 2440. 
