1284 
id 
Examination of the place of section of the nerves showed in the 
first place that in the greater half of the cases, viz. in 11 of the 
20 aminals of group 6 which were operated upon, a complete union 
of the heterogeneous nerves had taken place. The central cut-end 
of the hypoglossus adhered firmly to the peripheral portion of the 
lingualis, and after one or two months the peripheral portion of the 
joined nerve had turned white again, viz. had become myelinised. 
After a due lapse of time even the place of union of the nerves, 
the cicatrice itself, was white. I however got the impression, that 
the process of union of the cut-ends has a somewhat longer duration 
than after the dissection and joining of homogeneous nerve-portions. 
The experiments of group a showed, that already after the lapse 
of one month regenerating nerve-fibers were visible in the tongue, 
and after one and a half month regenerating motor endplates were 
visible on the musele-fibers even at the tip of the tongue. In the 
experiments of group b it was only after 2 or 3 months, that I 
was able to detect the regenerating fibers inside the tongue. 
These results were confirmed in all points by the microscopic 
examination. The regenerating nerve-fibers of the hypoglossus had 
grown through the cicatrice, had reached the peripheral portion of 
the lingualis and had grown into it just as in the regenerative union 
of homogeneous nerve-ends. Sections through the place of union tend 
to show the same intertwisting of the neurofibrillar bundles, the 
regenerating axons, in the cicatrice, the slow forward movement, 
and at the end the same picture of the regenerating axons penetrating 
into the channel of the degenerated peripheral portion, in casu the 
n. lingualis. Nearly all the regenerating fibers of the hypoglossus 
penetrate into the peripheral nerve-end, in casu the n. lingualis. A 
few fibers only pass alongside and are seen growing out into the 
surrounding tissue, the perineural connective tissue. 
The examination of the microscopic sections gave me however the 
same impression as the macroscopic inspection, viz. that the process 
of regeneration, especially of the penetrating of the regenerating 
axons into the peripheral nerve-end (lingualis) has a somewhat longer 
duration and slower movement than in the union of homogeneous 
nerve-ends. The intertwisting of the axons is more dense, and a 
greater number of the so-called spirals of Prrronciro are formed. 
As however the nervus hypoglossus possesses a far greater number 
of nerve-fibers than the nervus lingualis, finally the peripheral nerve- 
end (lingualis) becomes entirely filled-up with the regenerating axons 
of the hypoglossus nerve. 
The examination of the cross-sections through the tongue gives 
