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 drawing, were employed in the construction of new series between the original initial and final series. As a result of the learning of the original and derived series there must in this case also be revealed how much of the saving in work is to be ascribed merely to the identity of the syllable masses and to the identity of the initial and final members of the separate series.

For each group of original and derived series 11 double tests were instituted, 55 therefore in all. These were distributed irregularly over about 9 months. The results were as follows: