1910] BLODGETT—BULBS OF ERYTHRONIUM 363 
appear to come into blunt contact, but do not curve inward. The 
margins unite along the line of contact, and the partitions are formed 
from a median rib projecting inward from each carpel (figs. 34, 35), 
_ meeting at the center of the ovary (TEMPLE 21). In the full-grown 
ovary, as at fertilization, the evidence for this interpretation of 
the case is found in the double bundles along the line of dehiscence 
in the walls of the ovary, and in the 
presence of a layer of cells rich in pro- 
toplasm which passes around the end of 
the abutting partitions as they come 
into contact at the center of the ovary 
(text fig. 7). The densely protoplasmic 
cells which line the ovary along the line 
of the placentae continue around the 
end of each median wing, as shown in 
the photograph. This series of surfaces 
of slight contact determines the dehis- 
cence of the ripe capsule. 
Occasional plants are found with 
Sterile anthers on one or more of the 
stamens, some patches showing many of 
the plants with no functional pollen. It 
has been found that the sterility of the 
anthers begins at least as early as the 
divisions of the pollen mother cells, as 
buds have been examined in which three 
of the anthers were normal, and had 
normal pollen grains; while the sporo- 
enous tissue of the others was degen- 
erating (fig. 35, m, m’); the other 
Ussues of the anthers were normal in appearance. In the field it 
has been noticed that the plants with dark pollen on the stigma 
had the larger fruits and the larger number of seeds. Plants 
having pale anthers often lacked pollen entirely, and their seed- 
developing power seemed to be deficient also. The plants of the 
two types, fertile with dark stamens and poor with pale anthers, 
€ach occur in patches often of considerable numbers. This may 
_ at edges of fused carpels (8); 
X25. 
