care of the pedometer, dusting it, and
polishing its metal parts. All the surfaces of the pedometer are so
smooth and well polished that they invite the care that is taken of
them, and by their appearance when finished fully repay the trouble
taken.

The pedometer represents the scientific part of the method, because it
has reference to the anthropological and psychological study made of
the children, each of whom has his own biographical record. This
biographical record follows the history of the child's development
according to the observations which it is possible to make by the
application of my method. This subject is dealt with at length in my
other books. A series of cinematograph pictures has been taken of the
pedometer at a moment when the children are being measured. They are
seen coming of their own accord, even the very smallest, to take their
places at the instrument.

THE METHOD

The technique of my method as it follows the guidance of the natural
physiological and psychical development of the child, may be divided
into three parts:

Motor education.
Sensory education.
Language.

The care and management of the environment itself afford the principal
means of motor education, while sensory education and the education of
language are provided for by my didactic material.

The didactic material for the _education of the senses_ consists of:

(_a_) Three sets of solid insets.
(_b_) Three sets of solids in graduated sizes, comprising:
(1) Pink cubes.
(2) Brown prisms.
(3) Rods: (_a_) colored green; (_b_) colored alternately
red and blue.
(_c_) Various geometric solids (prism, pyramid, sphere, cylinder,
cone, etc.).
(_d_) Rectangular tablets with rough and smooth surfaces.
(_e_) A collection of various stuffs.
(_f_) Small wooden tablets of different weights.
(_g_) Two boxes, each containing sixty-four colored tablets.
(_h_) A chest of drawers containing plane insets.
(_i_) Three series of cards on which are pasted geometrical forms
in paper.
(_k_) A collection of cylindrical closed boxes (sounds).
(_l_) A double series of musical bells, wooden boards on which are
painted the lines used in music, small wooden discs for
the notes.

_Didactic Material for the Preparation for Writing and Arithmetic_

(_m_) Two sloping desks and various iron insets.
(_n_) Cards on which are pasted