'  J.  F.  W.  Silk,  "An  Analysis  of  a  Series  of  1600  Nitrous  OxiJe
Administrations  Recorded  Systematically,"  Tram.  Odontological  Soc,
June  1890.  I  am  indebted  to  Dr.  Silk  for  further  elucidations  regard-
ing several  points,  and  also  for  additional  figures.
HYPNOTIC    PHENOMENA.  315

Erotic  symptoms  were  found  by  Dr.  Silk  to  have
undoubtedly  occurred  in  six  cases  out  of  the  whole
series,  and  always  in  women,  with  one  exception  in
young  unmarried  women  under  the  age  of  24.  In-
voluntary micturition  occurred  ten  times,  invariably
in  females;  twice  in  children  under  14  (which  was,
relatively,  a  large  proportion,  i.e.,  20  per  cent.),  the
remainder  in  women  between  that  age  and  40.
