1917] BRYAN—ARCHEGONIUM OF CATHARINEA II 
one save an old-fashioned, rigid morphologist. After the first 
initial has been added to the canal row, the apical cell again begins 
to cut off peripheral segments (figs. 20, 23), but in the meanwhile 
the periphery is also growing by intercalary divisions (figs. 10, 
20, 22). While these peripheral processes are going on, the cells 
of the neck canal row are not inactive. The primary neck canal 
cell may divide first (figs. 20, 21), or the initial cut from the base 
of the cover cell may make the first division (fig. 22). That there 
are intercalary divisions in almost any order at this stage of the 
process may clearly be seen from the series represented by figs. 
25-28. The archegonium has now reached the stage when it con- 
tains 4 or 5 neck canal cells. At this time the evidence is positive 
that the cover cell adds a second initial to the row of neck canal 
cells (figs. 29, 31). Fig. 29 illustrates excellently the intercalary 
as well as apical growth of the archegonium. — 
While fig. 31 is of interest in showing the activity of the cover 
cell in adding an initial to the canal row, it has an additional inter- 
est in giving evidence as to the origin of oblique walls in the axial 
row. The axis of the spindle is tilted and an oblique wall is being 
formed. In fig. 32 the process has been completed and the result 
is very evident. There are then two ones eae the oblique walls ee 
in the canal row. The first we have 
fig. 15. No reliable evidence could be found that these walls 
might arise in any other way, such, for example, & as the iepercniney ee 
_ division of a canal cell. As a result of inter o 
_ activity the canal row now contains 5~7 canal cells. 
that follow there is no definite sequence that can 
= oyster statement that can be mz de 1S 1 
-* canal cells eased by intercalary aie 
es ie, as: 
VFS 
- Just how active the cover cells at this time cannot the stated, . ap 
