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For convenience’ sake we will term the plane through the beak 
and the middle of the two pupils: the horizontal plane. The two 
halves of the bulbus oculi separated by this horizontal plane we 
will term the lower (nearest to the jaw) and the upper half (nearest 
to the cranial plane). In the same way the frontal plane through 
the middle of the two pupils, divides the bulbus into a nasal and 
a cerebral half. 
Now, when we make horizontal sections in the inferior nasal 
quadrant, we come obliquely upon the above-mentioned eyesplit and 
muscular fascicle. When making a radial section at an angle of 
+ 45° to the horizontal plane, we pass along the muscular fascicle 
in its whole length, and are thus in a position to determine its anatomic 
relations. 
Besides the method of fixation, embedding in celloidin and the 
making of sections, there is another, viz. preparing the uvea under 
the binocular microscope. 
To this end the posterior, median, half of the bulbus of a fresh, 
enucleated eye, was removed. 
Along with the anterior stratum of the retina the retinal cell-layer 
_of the processus ciliares was pulled off, in which process also the 
Zonula of Zinn and the corpus vitrium were removed without 
injuring the basement membrane of the corpus ciliare. Also the lens, 
held firmly in its capsule, could now be detached from the processus 
ciliaris without any harm to the latter. 
Now, when we subsequently take up the exposed periphery of 
the iris and make some cuts in the iris, we can tauten the lig. 
pectinatum by laying back interiorly — towards the median plane 
— the sectors formed. With a sharp knife the fibers of this ligament 
are split close to the basement membrane; then the basement mem- 
brane of the corp. cil. is to be laid back still further, the spaces 
of Fontana are completely open and the medial side of the ciliary 
muscles is laid bare. 
When examining the nasal-inferior quadrant of the urea, before 
treating it in the manner just described, we observe that the 
processus ciliares diverge from their radial course at the spot where 
we should look for the eye-split. They bend round in the direction 
of the nasal tangent. They make an impression as if they run over 
an arched sublayer. 
Now, when opening in this quadrant the spaces of Fontana, we 
notice some details, just peripheral to the spot where the processus 
ciliares bent their course. 
At the place of insertion of Möürrer's muscle into the interior 
