988 
the nucleus, running between the myofibrillae of the cell, and thus 
showing their intracellular position, finally giving off branches, that 
are so exceedingly fine and form such small mehses, that they cannot 
be distinguished from the protoplasmatic reticulum of the cytoplasm 
of the muscle-cells itself. Indeed, one gets the impression, that these 
finest terminal branches, given off by the delicate threads of the 
intraprotoplasmatic neurofibrillar reticulum, described above, are in 
the end nothing else but the protoplasmatic reticulum. 
That this intraprotoplasmatie neurofibrillar reticulum with its ring- 
shaped varicosities and end-rings or terminal nets at the end of 
short twigs in reality lies inside the cell in the cytoplasm and 
not applied to the surface at the outside of the cell, may be demon- 
strated in the first place by the following fact. The muscle-cells of 
the musculus ciliaris are not always compact, but especially in the 
inner part more loosely arranged, so that in tangential sections 
through the inner parts of the corpus ciliare one often sees muscle- 
cells lying entirely isolated in the connective tissue. In these cases 
it is easy to determine whether the second neurofibrillar reticulum, 
mentioned above, lies inside the cytoplasm of the muscle-cell or 
simply surrounds the cell at the outside, and the intraprotoplasmatic 
position of this second reticulum with its ringshaped varicosities and 
end-rings, together with the very delicate threads passing from this 
netwerk into the protoplasmatie reticulum could be established with 
accuracy. Still, there is room for doubt, for a bundle of two muscle- 
cells might be cut lengthwise and it might be possible, that what 
was thought to lie in the cytoplasm, in reality was lying just 
between the two muscle-cells. 
But the conclusion that the terminal branches of the neurofibrillar 
apparatus together with the terminal rings are intraprotoplasmatic 
in position is placed on a perfectly sure basis, when cases are found 
as are figured in fig. 2 g and /. Here we see the small terminal rings 
and nets of the second neurofibrillar network lying so close to the 
nucleus of the muscle-cell, that they even make an indentation into 
the nucleus, and thus are found lying in a shallow hole in the side 
or on the top of the elongated nucleus (fig. 2 g and h). Such cases 
are not rare in my preparations, indeed in nearly every section 
through the musculus ciliaris were found one or two of them; they 
can only be explained by adopting an intraprotopiasmatic position 
for the neurofibrillar rings. In many of these cases the connection 
of the rings, lying in the indentation of the nucleus, with the neuro- 
fibrillar network could be observed with perfect accuracy, and in 
several cases the direct connection of this intraprotoplasmatic neuro- 
