Fig. 1. Joni on a rope ladder
Fig. 2. Roody (at 6) on a rope ladder

Fig. 3. Joni on a tree
Fig. 4. Roody (4 y. 7 m.) on a tree

Fig. 1. Carrying ball (Roody 1 y. 2 m.)
Fig. 2. Pushing ball with foot (Roody 2 y. 3 m.)
Fig. 3. Catching up ball (Roody 2 y. 4 m.)

Fig. 4. Throwing ball with hand (Roody 2 y. 1 m.)
Fig. 5. Throwing down nine-pins (Roody 2 y. 1 m.)
Fig. 6. Playing with ball (Roody 2 y. 4 m.)

Fig. 1. Turning a pianoforte-stool (Roody 2 y. 2 m.)
Fig. 2. Turning the wheel of a sowing machine (Roody 2 y. 9 m.)
Fig. 3. Driving a hoop (Roody 3 y. 3 m.)

Fig. 4. Driving a small wheel (Roody 4 y. 1 m.)
Fig. 5. Rolling eggs (Roody 3 years)
Fig. 6. Spinning a humming top (Roody 4 y. 4 m.)

Fig. 1. Roody (2 y. 2 m.) blowing the trumpet
Fig. 2. Roody (2 y. 3 m.) inflating a squeaking “devil”
Fig. 3. Roody (2 y. 9 m.) beating the drum

Fig. 4. Roody (2 y. 6 m.) playing the cymbals
Fig. 5. Roody (3 years) playing an accordion
Fig. 6. Roody (4 y. 1 m.) playing a tey-piano

Fig. 1. Splashing water (Roody 1 y. 1 m.)
Fig. 2. Spreading water about (Roody 1 y. 4 m.)
Fig. 3. Pouring water (Roody 2 y. 1 m.)

Fig. 4. Playing with water — launching a steamer (Roody 2 y. 4 m.)
Fig. 5. Playing with water — washing linen (Roody 2½ y.)
Fig. 6. Making a water fountain (Roody 2 y. 6 m. )

Fig. 1. Roody (1 y. 4 m.) playing with a hair
Fig. 2. Joni playing with a hair
Fig. 3. Gets acquainted with brush (Roody 9 m.)

Fig. 4. Making sand-cakes (Roody 2 y. 1 m.)
Fig. 5. The sand-cakes ready (Roody 2 y. 1 m.)
Fig. 6. Flattening out sand-cakes (Roody 2 y. 1 m.)

Fig. 1. Roody (2 y. 4 m.) looking through transparent objects
Fig. 2. Looidng into stereoscope (Roody 4 y.)

Fig. 3. Examining objects through magnifying glass
Fig. 4. Looking into self-made “field-glass”

Fig. 1. Blowing out soap bubbles (Roody 3 y.)
Fig. 2. Admiring a bubble
Fig. 3. Looking at the play of colours of a toy-balloon.

Fig. 4. Striking a match (Roody 1 y. 2 m.)
Fig. 5. Looking at the flame of a candle
Fig. 6. Extinguishing flame(Roody 3 y.)

Fig. 1. Touching intriguing object with stick (Roody 2 y. 10 m.)
Fig. 2. Drawing lilies with stick (Roody 2 y. 2 m.)
Fig. 3. Waving stick (Roody 2 y. 1 m.)

Fig. 4. Beating off leaves with stick (Roody 1 y. I m.) (Characteristic protrusion of tongue)
Fig. 5. Riding a stick (Roody 4 y. 5 m.)

Fig. 1. Astonishment; opening of mouth by child on seeing novel object (Roody 9 m.)
Fig. 2. Astonishment; Joni opens mouth while looking into mirror
Fig. 3. Typical posture of fixed attention — Roody (4 years) examining hedge-hog

Fig. 4. Typical posture of fixed attention Joni looks at box
Fig. 5. Roody's (1 y. 5 m.) mimics of attention
Fig. 6. Roody (3 y. 4 m.) mimics of attention