Bauhaus-Universität Weimar

Titel:
Helmholtz's treatise on physiological optics. Volume 1. Edited by James P. C. Southall. Translated from the 3rd German edition
Person:
Helmholtz, Hermann von
PURL:
https://digitalesammlungen.uni-weimar.de/viewer/image/lit39649/27/
§1. General Structure of the Organ of Vision 
3 
2, 3.] 
from Joh. Müller,1 represents a number of such cones from the eye 
of a nocturnal butterfly. The facets of the cornea are indicated by 
the letter a, the transparent cones by b, the fibres of the optic nerve 
by c, and the pigment between them by d. 
If each cone were provided with only one nerve fibre, the field of 
vision would be divided only into as many parts as there were cones. 
Recently, however, Gottsche2 has demonstrated that an optical 
image of objects in front of the eye is thrown on the inner ends of the 
Fig. 2. 
cones. Consequently, if a number of perceptive nerve elements were 
present, there might be still another subdivision of individual impres¬ 
sions in each cone. If there were only one nerve element for each cone, 
the refraction of the light would still have a functional significance, 
because light falling parallel to the axis of the cone is concentrated on 
the end of the nerve fibre, and that from other adjacent points in the 
field of vision is prevented from reaching it more effectively by this 
means than by septa. 
1 Zur vergleichenden Physiologie des Gesichtssinnes. Leipzig 1826. S. 349. Taf. VII. 
Fig. 5. 
2 J. Müllers Archiv, für Anat. u. Physiol. 1852. S. 483.
        

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