XXIV CONTENTS. 



PAtfB 



LECTURE XII. THE NERVOUS SYSTEM . . . .280 



Peripheral terminations of the nerves. Nerves of special sense. The skin 

 and the distinction of vessel-, nerve-, and cell-territories in it. Olfactory 

 mucous membrane. Retina. Division of nerve-fibres. The electrical 

 organ of fishes. Muscles. Further consideration of nerve-territories. 

 Nervous plexuses with ganglioniform enlargements. Intestines. Errors 

 of the neuro-pathologists. The great nervous centres. Grey substance. 

 Ganglion- [nerve-] cells containing pigment. Varieties of ganglion- 

 cells ; sympathetic cells in the spinal marrow and brain, motor and sensi- 

 tive cells. Multipolar (polyclonous) ganglion-cells. Different nature of 

 the processes of ganglion-cells. 



LECTURE XIIL- SPINAL CORD AND BRAIN . . .302 



The spinal cord. White and grey matter. Central canal. Groups of gang- 

 lion-cells. White columns and commissures. The medulla oblongata 

 and the brain. Its granular and bacillar layer. The spinal cord of the 

 petromyzon and its non-medullated fibres. The intermediate substance 

 (interstitial tissue). Ependyma ventriculorum. Neuro-glia. Corpora 

 amylacea. 



LECTURE XIY. ACTIVITY AND IRRITABILITY OF CELLU- 

 LAR ELEMENTS. DIFFERENT FORMS OF IRRITATION . 321 



Life of individual parts. The unity of the neurists. Consciousness. Activ- 

 ity of individual parts. Excitability (irritability) as a general criterion of 

 life. Meaning of irritation. Partial death. Necrosis. Function, nutri- 

 tion, and formation, as general forms of vital activity. Difference of 

 irritability according to the different forms of activity. Functional irri- 

 tability. Nerves, muscles, ciliated epithelium, glands. Fatigue and func- 

 tional restitution. Stimuli. Their specific relations. Muscular irritabi- 

 lity. Nutritive irritability. Maintenance and destruction of elements. 

 Inflammation. Cloudy swelling. Kidney (morbus Brightii) and cartilage. 

 Neuro-pathological doctrines. Skin, cornea. The humoro-pathological 

 doctrines. Parenchymatous exudation, and parenchymatous inflamma- 

 tion. Formative irritation. Multiplication of nucleoli and nuclei by 

 division. Multi-nuclear cells; marrow-cells and myeloid tumours. Com- 

 parison between formative muscular irritation and muscular growth. 

 Multiplication (new formation) of cells by division. The humoro- and 

 neuro-pathological doctrines. Inflammatory irritation as a compound 

 phenomenon. Neuro-paralytical inflammation (Vagus, Trigeminus). 



LECTURE XY. PASSIVE PROCESSES. FATTY DEGENE- 

 RATION . 356 



Passive processes in their two chief tendencies to degeneration ; Neerobi- 

 osis (softening and disintegration) and induration. Fatty degeneration. 

 Histological history of fat in the animal body ; fat as a component of the 

 tissues, as a transitory infiltration, and as a necrobiotic matter. Adipose 

 tissue. Polysarcia. Fatty tumours. Interstitial formation of fat. Fatty 



