512 ROBERT W. HEGNER 
black spherical bodies are yolk globules (y) which appear to 
originate near the periphery and gradually to migrate into the 
central region. The bacteria-like rods are still present but they 
are widely scattered and faintly staining. 
By the time the next stage is reached (fig. 15, J; fig. 36) the 
bacteria-like rods have completely disappeared everywhere 
except near the periphery, around the lower part of the oocyte. 
According to Blochmann (’86) they are still present in this region 
after the eggs are laid, and they are also mentioned by Tanquary 
(13) in the freshly deposited eggs. The latest oocyte studied 
by the writer is Stage L (fig. 15, Z), which is considerably younger 
than the fully grown egg. <A few faintly staining rods still exist 
at this stage near the posterior end. 
The compact group of secondary nuclei which surround the 
oocyte nucleus up to this stage now breaks up, and the individual 
nuclei become scattered throughout the entire egg near the 
periphery. Quite a number of them still appear near the anterior 
pole of an oocyte in Stage K (fig. 15, K; fig. 37) where they sur- 
round the opening into the nurse chamber. At some distance 
back of this pole the secondary nuclei are imbedded in the 
cytoplasm especially near the perpihery. They retain at this 
time (Stage K) the characteristics noted in early stages; 1.e., 
they are more or less spherical, filled with a reticulum, and con- 
tain one or several large chromatin granules (fig. 38). Later 
(Stage L, fig. 15, L; fig. 39) they seem to be more numerous and 
a single egg must contain hundreds of them. -In this, the last 
stage examined, these secondary nuclei have changed in appear- 
ance as indicated in figure 40. The chromatin granules have 
become aggregated into a few irregular strands, a condition which 
may be a phase of degeneration or, as Loyez (’08) believes, a 
stage in the formation of yolk globules. The fate of the second- 
ary nuclei was not discovered and, so far as I know, none of the 
investigators who have described similar bodies has been able to 
determine with certainty what becomes of them. 
The posterior ends of the older oocytes in my series were 
carefully examined with a view to tracing the origin of the body 
which Tanquary (’13) observed near the posterior pole of freshly 
