Left-Handedness. Dr. Daniel Wilson president of the Royal Society of to which he has managed to give an unexpected and very practical interest affecting all who have children or who are concerned in their education. The author had written previously on this subject but not with such full and effective treatment. He reviews the vari ous causes to which the general preference of the right hand has been ascribed and also those to which the occasional cases of-left-handedness are attributed and finds them mostly unsatisfactory. He shows clearly that the preferential use of the right hand is not to be ascribed entirely to early training. On the contrary in many instances where parents have tied up the left hand of a child to overcome the persistent preference for its use the attempt has proved futile. He concludes that the general practice is probably due to the superior de velopment of the left lobe of the brain which as is well known is connected with the right side of the body. This view as he shows was originally suggested by the eminent anatomist Professor Gratiolet. The author adopts and maintains it with much force and adds the correlative view that ' left-handedness is due to an ex ceptional development of the right hemisphere of the brain.' A careful review of the evidence gives strong reason for believing that what is now the cause of the prefer ence for the right hand was originally an effect. Neither the apes nor any others of the lower animals show a similar inclination for the special use of the right limbs. It is a purely human attribute and probably arose gradually from the use by the earliest races of men of the right arm in fighting while the left arm was reserved to cover the left side of the body where wounds as their experience showed were most danger ous. Those who neglected this precaution would be mostly likely to be killed ; and hence in the lapse of time the natural survival would make the human race in general 'night-handed' with occasional re
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