68 TRANSACTIONS OF THE 
results yet obtained in diagnosing handedness. The test 
however is still relatively valueless until norms of ability 
have been developed through wide application to large 
groups. When this is accomplished one could compare 
an individual’s'score with the norm, and say with reason- 
able definiteness, for example, that subject ‘‘A’” whose 
score is x could safely be changed to right-handedness 
without any appreciable loss in dexterity, while subject 
“B” whose score is y, ought by all means to remain left- 
handed. 
All that is claimed for the investigation is that it 
has discovered and made possible a more scientific means 
of diagnosing handedness, and has thereby facilitated the 
elaboration of these and other findings in the field. 
In conclusion, it would seem that the opportunities 
and the obligations of science in regard to the problem of « 
left-handedness has two well-defined aspects. First, to 
facilitate the adaptation of those persons who are strongly 
left-handed to their right-handed environment, and 
second, to effect an early change to right-handedness in 
those who are known to possess only a slight left-handed 
tendency, or are nearly ambidexterous. 
It is hoped that this discussion will indicate the need 
of a thoroughgoing scientific attack of the entire prob- 
lem of handedness, not alone by psychologist, but by 
physiologist as well. _In the first place, a survey of the 
entire problem should be made which will include all of 
the normal as well as the abnormal aspects, involving 
intensive experimental research of individual cases as well 
as extensive statistical study of types. Second, the tech- 
nique of the investigation should be carefully evolved and 
made altogether objective and verifiable. Third, the 
results, to be of value, should be critically interpreted. 
Such an attack of the problem of handedness would also 
materially assist in dispelling the intellectual fog which 
hovers around so much of our present discussion of the 
brain and its functions. 
