On the assumption of Dr. Brown-Sequard that the left hemisphere of the brain exceeds that of the right both in size and weight: in the deviations from this normal condition there ought to be found the corresponding development of the organ brought into use. But, like most other right-handed reviewers of the phenomena of left-handedness, he fails to appreciate the bearings of his own argument in the case of a left-handed person conforming in many ways to the usage of the majority, yet instinctively giving the preference to the left hand. He dwells on the fact that very few left-handed persons have learned to write with the left hand, and that those who can do not write nearly so well with it as with the right hand. Even in persons who are left-handed naturally, so that the right side of the brain may be assumed to control the reasoning faculties and their expression, he argues that the left side of the brain “can be so educated that the right hand, which that side of the brain controls, produces a better handwriting than that by the left hand, though that is controlled by the better developed brain.” But the reasoning is alike partial and misleading. The left-handed person systematically submits to disabilities in his efforts to comply with the usage of the majority, not only in holding his pen in the right hand, but in the direction and slope of the writing. A left-handed race would naturally write from right to left, sloping the letters towards the left, and so would place the right-handed penman at a like disadvantage, wholly independent of any supposed change in the functions or preponderating energy of either hemisphere of the brain. But even in the absence of practice, the command of the left hand in the case of a truly left-handed person is so great that very slight effort is required to enable him to write with ease with that hand.