27. In relation to carrying the shoulder backward it loses half of its effect, because, its force being decomposed (so to speak) by the obliquity of its direction, is divided into two channels. One of these runs parallel to the shoulder and acts to no purpose, while the other, being perpendicular to it, is alone effective; hence it must act with a force equal to 10, in order to produce an effect equal to 5. 28. The indication, to draw the humeral fragment outward, far from being fulfilled, is here diametrically counteracted. The scapula, being approximated to that of the opposite side, draws the humeral fragment towards the trunk, making it underlap the internal one, and, in this respect, the figure of 8 bandage acts posteriorly in precisely the same manner, during the treatment, that the contractions of the muscles did anteriorly before the reduction. 29. Should the shoulder be supported, at such an elevation, as might have a constant tendency to destroy the influence of its own gravity? this is evidently prevented by the very oblique direction of the turns of the bandage. Suspending the arm in a sling, is the only way, in which that end can be attained. But does this mode always possess sufficient firmness and stability? The arm, not being here sufficiently fixed, may be constantly in motion, which, by deranging its situation, must communicate very troublesome and injurious movements to the fragments of the clavicle. One of the principal faults of all bandages consists, in not preventing these movements, by restraining the movements of the arm. To the other disadvantages of this mode, need I add that of its making, by the turns of the bandage, an undue compression on the projecting edges of the arm-pit, and producing thereon troublesome and painful excoriations? 30. From the want of a mutual correspondence and fitness between the indications already enumerated (20), and the manner in which the figure of 8 bandage acts, it is evident that the former can never be satisfactorily fulfilled by the latter. Hence we may judge, what improvement the art has received from the iron cross of Heister, the compress of Petit, drawn transversely over the oblique turns of the bandage, the waistcoat which Brasdor fastened round the thorax of his patients, and the leathern apparatus, lately proposed by a German practitioner. These means, though diversified in their form, are similar in their effect, and, being nothing but modifications of the figure of 8 bandage, possess, like it, the radical fault of not offering a resistance directly opposed to the two-fold power, arising from the muscular action and the gravitation of the shoulder.