ABNORMAL IRRITABILITY PRODUCED By SaLts 707 
into contact with any solid or liquid body (conductor or non- 
conductor) the contractions of the muscle will be resumed, 
while they will gradually cease or diminish when the nerve 
is again surrounded by air on all sides. 
4. The fact that certain ions are capable of bringing 
about forms of irritability in nerves and muscles which do 
not exist normally may perhaps furnish the explanation of a 
number of certain morbid phenomena (neuroses, hysteria) in 
which the motor and sensory reactions of the patient are 
modified. 
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