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Nachdruck verboten. 
The Brain and Optie Ganglion of Leptodora hyalina. 
(Preliminary Paper.) 
By Epwarp P. Carton, B. S., Northwestern University Medical School, 
Chicago, Ill, U.S. A. 
With 28 Figures. 
The first investigator to publish approximately accurate drawings 
of the external relationships of the central nervous system of Leptodora 
hyalina was P. E. MÜLLER (’67). 
WEISMANN (’74), several years later, directed his attention more 
minutely to the same and pointed out errors made by previous investi- 
gators in their descriptions und drawings. He was the first investigator 
to study the minute anatomy of the brain and optic ganglion, although 
he did not cut any sections. The work was done entirely on animals of 
different age and sex — the eye, optic ganglion and brain being examined 
in toto, either fresh or after fixation in osmic acid. The giant cells 
of the brain were described by him, but, although he could easily 
see these large cells with processes directed forward in the brain of 
