LECTURE XIV. 



APRIL 7, 1858. 



ACTIVITY AND IRRITABILITY OF CELLULAR ELEMENTS. 

 DIFFERENT FORMS OF IRRITATION. 



Life of individual parts The unity of the neurists Consciousness Activity of 

 individual parts Excitability (irritability) as a general criterion of life Mean- 

 ing of irritation Partial death Necrosis. 



Function, nutrition, and formation, as general forms of vital activity Difference 

 of irritability according to the different forms of activity. 



Functional irritability Nerves, muscles, ciliated epithelium, glands Fatigue and 

 functional restitution Stimuli Their specific relations Muscular irritability. 



Nutritive irritability Maintenance and destruction of elements Inflammation- 

 Cloudy swelling Kidney (morbus Brightii) and cartilage Neuro-pathological 

 doctrines Skin, cornea The humoro-pathological doctrines Parenchymatoua 

 exudation, and parenchymatous inflammation. 



Formative irritation Multiplication of nucleoli and nuclei by division Multi- 

 nuclear cells ; medullary cells and myeloid tumours Comparison between for- 

 mative muscular irritation and muscular growth Multiplication (new forma- 

 inatioii) of cells by division The humoro- and neuro-pathological doctrines. 



Inflammatory irritation as a compound phenomenon Neuro-paralytical inflamma- 

 tion (Vagus, Trigeminus). 



I HAVE given you, gentlemen, a somewhat lengthy 

 sketch of the histological arrangements of the body, in 

 order to make the inference plain to you, which in my 

 opinion must be the starting point of all future conside- 

 rations that are instituted concerning life and vital ac- 

 tivity that, namely, in all parts of the body a splitting 

 up into a number of small centres takes place, and that 

 nowhere, as far as our experience extends, does a single 



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