248 
Suppose in the interstices between the metal-spots lecithin and 
cholesterin to be aggregated in a layer of Lanemurr, then it will 
lecithin 
be easy to imagine the quantity present to such an amount 
cholesterin 
that here again the same potential is reached, as has been forced 
upon the metal spots by the tissue-fluid. Only then will the potential 
of the cell-surface be considered equal everywhere, and will the 
condition for electric rest be satisfied. 
Now from the cell-surfaces, thus equipped, a number of actions 
proceed which depend on corpuscular radiation. To these belong: 
a. A number of automaticities such as 1° the automaticity of the 
heart of cold-blooded animals (7) (frog, toad, eel); 2° the automati- 
city of the heart of a warm-blooded animal (8) (rabbit); 3° the 
‘automaticity of the muscle fibres of the gut (rabbit, cat, mouse) (9); 
4° the automaticity of the esophagus (10); 5° the automaticity of 
the muscular fibres of the uterus (11); 
b. The synapsis-effects between vagus and cardiac muscle (12), 
between vasomotors and muscular coats of the arteries (13); 
c. The permeability of the capillary endothelia for water (14); 
d. The permeability of the glomerulusepithelia for glycose (15); 
e. The synapsis-effect between motory nerve and voluntary 
muscle (16) (on this occasion the distal contact-plane appeared to be 
sensitive to radio-activity). 
All these actions are subject to the law of aequiradio-active sub- 
stitution (17) and that of radio-physiological antagonism (18). 
When, in typical cases, these actions are brought about from 
some distance by free radiation (19), it appears that they possess a 
rather long latent period and a rather long after-effect, but when 
called forth materially by radio-active elements, the process is rapid 
and there is no time for penetrating of the ions or micella (20) 
into the interior of the cell. In that case there can only be question 
of a superficial process. 
The dosages of the added radio-elements, required for the action, 
may be modified by sensibilizators (21), some of them working 
through modifications of the adsorptions. This holds for fluorescein 
and eosin, as well as for adrenalin and cholin. The first two 
substances can supersede each other in a schematical experiment; 
talcum venetum figures as an absorbent. Likewise eosin can super- 
sede fluorescein. The reverse, however, is not possible (22). Also 
adrenalin and cholin are mutually antogonistie (23). In the heart- 
cells these substances are related just as in the schema: the super- 
session eosin-fluorescein is biologically one-sided, the supersession 
