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age of 15, although for two years previously was subject to mild attacks of 
restlessness and excitement. Every few weeks becomes either depressed or 
excited, and this is followed by a short lucid interval. 
Case XVIII. — Female, aged 41, single. Had an attack of excitement 
several years ago. For the last two and a half years has been very 
unsettled, sometimes depressed, sometimes excited. 
Case XIX. — Male, aged 30, single. At the age of 24 became depressed, 
but recovered ; broke down again at the age of 29, and passed through a 
severe attack of depression. 
Case XX. — Female, aged 49, married. At present in her fifth attack 
of depression. At the commencement of each of these attacks she was 
restless and excitable. 
Case XXI. — Female, aged 52, single. Had an attack of excitement 
four years ago ; broke down again at the age of 50, and is still depressed. 
Case XXII. — Female, aged 50, single. Broke down at the age of 35, 
passed through an attack of excitement. On this occasion has been ill for 
three years, and periodically passes through attacks of excitement, which 
are usually followed by a short period of depression. 
Case XXIII. — Female, aged 55, single. First broke down mentally at 
the age of 30. Since then has had many attacks of excitement and 
depression with lucid intervals, during which she has on several occasions 
been well enough to live at home. 
Case XXIV. — Male, aged 43, single. Has had several attacks of 
excitement and depression, and from which he has always recovered. 
Case XXV. — Male, aged 56, single. Had an attack of excitement at 
the age of 20, and another fourteen years later, from both of which he 
recovered. Present attack commenced at the age of 37. Since then he 
has had alternating attacks of excitement and depression with lucid 
intervals lasting for a few weeks. 
Case XXVI. — Male, aged 54, widower. Has been ill since the age of 50, 
but for most of his life has been subject to transient “ moods ” of excitement 
and depression. 
Case XXVII. — Female, aged 46, married. Became depressed at the age 
of 41, and since then until she recovered five years later passed through 
definite attacks of depression, which were succeeded by short periods of 
restless excitement. 
Case XXVIII. — Female, aged 58, widow. Had an attack of depression 
at the age of 57, from which she recovered. Broke down again at the age 
of 58, and since then has been alternately excited and depressed. 
Case XXIX. — Female, aged 28, single. At the age of 20 became 
