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ANNE M. LUTZ 
Fig. 9. 0. Lamarckiana, plant No. 2488, C. S. H., 1908. Offspring of 0. lata 
X 0. Lamarckiana. Polar view of metaphase group of 14 chromosomes showing 
■a and b each with a clear area near one extremity of the body. 
Fig. id. Chromosome a, plant No. 3433, C. S. H., 1908; a 21-chromosome 
mutant offspring of O. lata X 0. Lamarckiana. Chromosome b, plant No. 3627, 
C. S. H., 1908; 0. albida, a 15-chromosome mutant offspring of 0. Lamarckiana. 
Chromosome c, plant No. 1133, 1907; 0. gigas offspring of 0. gigas. All taken from 
polar views of metaphase groups; a and b each display a single large, clear area, 
while two such regions may be observed in c. Owing to the fact that a and b are 
more heavily stained than c and than the chromosomes of figs. 6-9, the linin sur- 
rounding the clear area in a and b appears as delicate side-lines connecting the heavily 
-stained portions, while it is invisible in the remaining chromosomes mentioned. The 
irelative positions of the heavily stained regions clearly show that we are dealing with 
■whole chromosomes and not with fragments. 
Fig. II. Type 5509, plant No. 5509. C. S. H., 1908. Supposed to be a 
modified form of O. oblonga. Mutant offspring of Q. Lamarckiana. Polar view of a 
metaphase group showing chromosome a torn apart in the region of the clear area 
and the small extremity displaced, probably by the knife in sectioning. 
Fig. 12. O. nanella, plant No. 2788, C. S. H., 1908. Offspring of 0. nanella. 
Lateral view of daughter chromosomes in anaphase showing clear areas in corre- 
sponding regions. Note the delicate linin side-lines connecting the heavily stained 
portions. 
Fig. 13. 0. gigas, plant No. 4662, C. S. H., 1909. Offspring of 0. gigas. De- 
scription the same as for fig. 12, 
