atic sense lead, in the case of the older
children, to the development of the "color memory." A child having
looked carefully at a color, is then invited to look for its companion
in a mixed group of colors, without, of course, keeping the color he
has observed under his eye to guide him. It is, therefore, by his
memory that he recognizes the color, which he no longer compares with
a reality but with an image impressed upon his mind.

The children are very fond of this exercise in "color memory"; it
makes a lively digression for them, as they run with the image of a
color in their minds and look for its corresponding reality in their
surroundings. It is a real triumph for them to identify the idea with
the corresponding reality and to _hold in their hands_ the proof of
the mental power they have acquired.

* * * * *

Another interesting piece of material is a little cabinet containing
six drawers placed one above another. When they are opened they
display six square wooden "frames" in each. (Fig. 16.)

[Illustration: FIG. 16.--CABINET WITH DRAWERS TO HOLD GEOMETRICAL INSETS.]

Almost all the frames have a large geometrical figure inserted in the
center, each colored blue and provided with a small button for a
handle. Each drawer is lined with blue paper, and when the geometrical
figure is removed, the bottom is seen to reproduce exactly the same
form.

The geometrical figures are arranged in the drawers according to
analogy of form.

(1) In one drawer there are six circles decreasing in diameter. (Fig.
17.)

[Illustration: FIG. 17.--SET OF SIX CIRCLES.]

(2) In another there is a square, together with five rectangles in
which the length is always equal to the side of the square while the
breadth gradually decreases. (Fig. 18.)

[Illustration: FIG. 18.--SET OF SIX RECTANGLES.]

(3) Another drawer contains six triangles, which vary either according
to their sides or according to their angles (the equilateral,
isosceles, scalene, right angled, obtuse angled, and acute angled).
(Fig. 19.)

[Illustration: FIG. 19.--SET OF SIX TRIANGLES.]

(4) In another drawer there are six regular polygons containing from
five to ten sides, _i.e._, the pentagon, hexagon, heptagon, octagon,
nonagon, and decagon. (Fig. 20.)

[Illustration: FIG. 20.--SET OF SIX POLYGONS.]

(5) Another drawer contains various figures: an oval, an ellipse, a
rhombus, and a trapezoid. (Fig. 21.)

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