The first series of experiments consisted in showing the child various colours and requiring him to name them, the results being expressed in percentages of correct answers to the whole number.

Now this experiment involves no less than four different questions, and the results give absolutely no clew to their separation.

It involves: 1.

The child's distinguishing different colours displayed simultaneously before it, together with the complete development of the eyes for colour sensation.2.The child's ability to recognise or identify a colour after having seen it once.3.An association between the child's colour seeing and word hearing and speaking memories, by which the proper name for the colours is brought up in his mind.

4.
Equally ready facility in the pronunciation of the various names of the colours which he recognises; and there is the further embarrassment, that any such process which involves association of ideas, is as varied as the lives of children.