Sentence:  &#91;[https://archive.org/details/cornhillmagazine31londuoft/page/153/mode/1up page 153]&#93; But perhaps the most remarkable illustration of a <WSD>double life</WSD> is one which has been brought before the notice of the scientific world recently; [...] "A sergeant of the French army, F——, twenty-seven years of age, was wounded at the Battle of Bazeilles, by a ball which fractured his left parietal bone. [...] &#91;[https://archive.org/details/cornhillmagazine31londuoft/page/154/mode/1up page 154]&#93; Three or four months after the wound was inflicted, periodic disturbances of the functions of the brain made their appearance, and have continued ever since. [...] For four years, therefore, the life of this man has been divided into alternating phases, short abnormal states intervening between long normal states." 
Meaning of the word marked with <WSD> tags:  An existence or life that has two aspects, particularly when one of them is regarded as embarrassing, immoral, or unlawful and thus kept hidden from a person's family, friends, and work colleagues.