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 (E) The Reliability of the Tests.

(F) Serviceability.

In the promised monograph more complete details will be presented which would be out of place in this brief article.



(A) THE TEST MATERIAL

I. The Blocks

The Blocks which are used are manufactured by the Embossing Co., and may be secured at any of the large department stores and at various distributing centers of Milton Bradley's. There are sixteen cubes of one inch dimension and all are painted as follows:
 * One side red
 * One side blue
 * One side white
 * One side yellow