Idiots, deficient in energy; in sensitivity,
Illness, permanent effect on growth,
Illumination, method of regulating it
  when making composites;
  requires to be controlled,
Illusions, (see also Hallucinations, cases of)
Imagery, mental,
Indian Civil Service, candidates for,
Individuality, doubt of among the insane,
  among the sane,
Influence of Man upon race,
Insane, the,
  similar forms of it in twins,
Inspiration analogous to ordinary fluency,
  morbid forms of,
Instability,
Instincts, variety of,
  criminal;
  slavish (see chapter on Gregarious and
  Slavish Instincts)
Intellectual differences,

Jesuits in S. America,
Jukes, criminal family,

Kensington Gardens, the promenaders in,
Key, Dr. J.,
Kingsley, Miss R.,
Kirk, Sir John,

Laboratories, anthropometric,
Larden, W.,
Legros, Prof.,
Lehman and Bleuler, (note)
Letters, association of colour with,
Lewis, G.H.,
Lewis, Miss,
Life-histories, their importance,
Livingstone, Dr.,
Longevity of families,

Macalister, Dr.,
M’Leod, Prof.  H.,
Madness (see Insanity)
Mahomed, Dr.,
Malthus;
  marriage portions,
Man, his influence upon race,
Mann, Dr.,
Marks for family merit,
Marlborough College,
Marriages,
  early and late,
  with persons of good race;
  marriage portions;
  of Fellows of Colleges;
  promotion of,
Medians and quartiles,
Memory,
  physiological basis of;
  confusion of separate memories,
Mental imagery,
Meredith, Mrs.,
Milk offered by she-goats and wolves to children,
Moors, migrations of the,
Moreau, Dr. J. (of Tours),
Morphy, P.,
Muscular and accompanying senses, tests of,
Mussulmans,
  small fear of death;
  things clean and unclean,

Namaquas in Damara Land,
  (see also Bushmen)
Napoleon I.,
  views in connection with the
  faculty of visualising;
  his star,
Nature (see Nurture and Nature)
Necessitarianism,
Negro displaced by Berbers;
  by Bushmen;
  exported as slaves;
  replaceable by Chinese,
Nervous irritability, as distinct from sensitivity,
New Guinea,
Nicholson, Sir C.,
Notes, audibility of very shrill,
Nourse, Prof.  J.E.,
Number-forms,
Numerals, their nomenclature;
  characters assigned to them;
  coloured,
Nurture and nature;
  history of twins,
Nussbaumer, brothers,

Observed order of events,
Octiles,
Ogive (statistical curve)

Osborn, Mr.
Osten Sacken, Baron v. 
Oswell, Mr.
Oxen (see Cattle)