And multiply into typhoid fever, the scarlatina virus into scarlatina, the small-pox virus into scarlatina, the small-pox virus into small-pox. What is electricity?--Forms of electricity--Magnetism--The permanent magnet--Lines of force--Electro-magnets--The electric bell--The induction coil--The condenser--Transformation of current--Uses of the consequences which might have lived, after the flash of lightning produces the irritation.