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146 that when the head is held on one side, this is occasioned by the tension of the sterno-cleido-mastoideus muscle of the affected side, and the laxity of the corresponding muscle on the opposite side. This is also remedied by a similar contrivance, which is now extensively patronized.

It is worthy of remark, that the distortion of the neck is often complicated with roundness of the shoulders, in consequence of the violent contrac­tion of the pectoral muscles, which are not properly counterbalanced by the muscles of the back. To remedy this, we have invented a, which may be worn either inside or outside the dress, without being noticed as anything sin­gularly conspicuous.

This may be worn with or without the patent neck collar, according to the nature of the case; and when both are required they can be united by a simple contrivance. They invariably tend to check the distortion which first suggested their absolute necessity. The would be of great advantage in schools, to prevent the constant bending of the head for­ward, and is therefore adopted as an essential part of the dress of a young lady at the age when such habits are likely to be formed, as then even