166 RAYMOND BINFORD 
it could be seen at the summit of the out-pushed portion. It 
may be that the lengthening of this body is the force that turns 
this distal cavity inside out. 
In the next step of the capsular inversion the thick covering 
of the out-pushed part shown in figure 67 becomes turned out 
laterally so as to form a collar (fig. 68,7.) and the inner tubule 
becomes farther everted. The collar formed at this stage per- 
sists unchanged throughout all the further modifications of the 
capsule. The central body may now become greatly increased 
in length so that it projects beyond the out-turned part of the 
inner tubule (fig. 69, c.b., also figs. 70 to 72). From this stage 
on to the completion of the eversion there is little further increase 
in the length of this axis. The everted portion of the inner 
tubule, however, swells out more and more (figs. 77 to 79). The 
transition from the condition shown in figures 71 and 76 to that 
in figures 77 to 79 is brought about by a further eversion of the 
inner tubule. The part of the inner tubule involved in this 
second definite eversion is probably marked by the funnel-shaped 
portion in figure 76. The portion of the everted wall, derived 
from the part of the tubule turned by this second eversion, is 
indicated by the granule g in figure 77. At this stage there is 
another pause while the out-turned part continues to swell. 
Finally, the tension becomes so great that another portion of 
the inner tubule is everted and, as it turns, the wall of the cap- 
sule is also turned through the collar formed in the early stage 
of the process of eversion. This last eversion is shown halfway 
completed in figure 80, and the completed process in figure 81. 
In the latter figure the central body stands on the apex of the 
eversion and the inverted capsule (izv.c.) is above the collar (r.). 
In dilute solutions of the salts used, the protoplasmic portion, 
which contains the nucleus and mitochondrial substance, swells 
up to a spherical body as shown in figure 82. Often one finds 
on the slides, bodies like the one represented in figure 83. It 
is evident that these are exploded spermatozoa from which the 
everted inner tubule has disappeared, leaving the central body 
(c.b.), the inverted capsule (inv.c.), the collar (r.), and the shrunken 
nuclear cup (n.c.). 
