VotumeE XI Igo! NUMBER 2 
THE 
JournaL or Comparative Neurovoey. 
THE NEURONES AND SUPPORTING ELEMENTS OF 
THE BRAIN “OF A SELACHTAN,. 
By Gitsert L. Houser, 
Professor of Animal Morphology in the University of Lowa. 
With Plates VI—XIII. 
TABLE OF CONTENTS. 
SECTION I. INTRODUCTORY ; j 
SECTION II. REVIEW OF EARLIER RESEARCHES 
1. Anatomical Work Involving Errors of ifueroretmtign 
2. Work on the Microscopical Anatomy of the Brain 
SECTION III. METHODS OF INVESTIGATION 
. Chrome-Silver Impregnation 
2. The Application of Methylen-Blue 
a, The Staining Method of Nissi 
b, Intra-Vitam Injection 
3. Iron Haematoxylin : 
4. The Chloride of Vanadium Method 
SECTION IV. THE OBLONGATA 
1. General Morphology of the Obioagate 
Review of Nerve Components 
Neurones of the Ventral Cornu 
a. Tract-Neurones 
b. Commissural Neurones 
4. Lobus Vagi and Fasciculus Commins 
a. Neurones of the Lobus Vagi 
b. Termination of Communis Fibres 
c. The Fasciculus Communis 
The Viscero-Motor Nucleus ; 
General Cutaneous Nucleus and Spinal V Tract 
a. The Molecular Layer 
b. The Substantia Gelatinosa 
c. The Deeper Neurones , 
d. Termination of General euiaeoes Fibres 
7. The Tuberculum Acusticum : . : . 
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