986 
muscular coat of the intestine and of bloodvessels. The pictures only 
vary on account of the presence or of the distribution and number 
of the so-called terminal buds. Preparations after these methods are 
not sufficient however to study the intrinsic relations between nerve- 
endings and miuscle-cells. For this we need thin (5—10 u) serial 
sections of material sharply stained after the neurofibrillar staining- 
methods of Casati or Birnscnowsky and counterstained by Haema- 
toxylin and Eosin or Orange G. Unfortunately these staining-methods 
generally give only mediocre results, when applied to involuntary 
muscle-cells, and even in the best preparations the nervous plexuses 
between the muscular elements may be stained very sharply, but 
generally the final terminations are either not stained at all or take 
such a light stain, that it is impossible to draw any conclusions 
about the real relations between the nervous and muscular elements 
from them. 
Some time ago however I got at my disposal, thanks to the 
kindness of Prof. P. Ta. Kan, the director of the oto-laryngological 
section of the academic Hospital of our University, a freshly-enucleated 
normal human eye, which immediately after having been enucleated, 
had been put into a large quantity of neutral formaline-solution 
pres 
Parts of the corpus ciliare and iris of this object were treated by 
the method of BrerscHowskKy, and these preparations turned out to 
have taken such a splendid stain as I had never yet met with in 
any of my neurofibrillar preparations of plain muscle-cells. Beside a 
very good preservation of the different histological elements the 
sections showed a _ perfect and strong colouring of the nervous 
elements, of which even the finest ‘terminal fibrils and endings 
were visible as extremely delicate black lines, the thinnest of which 
were scarcely visible except under the highest power, but still stained 
a dark brown. 
In this object I studied the relations between the nervous elements 
and the muscle-cells of the corpus ciliare. Serial sections (4—20 u) 
were made through the corpus ciliare and iris in a transverse or a 
tangential direction. As a counterstain for the nuclei and the proto- 
plasm were used haematoxylin and eosin or orange G. Especially 
the tangential sections through the musculus ciliaris were very 
instructive. 
Letting alone for the moment the sensory innervation of the sur- 
rounding tissues, which need not be described here, we find, on turn- 
ing our attention to the musculus ciliaris, two different systems of 
nervous terminations between the muscle cells. In the first place a 
