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There are many other structural forms, both internal and external, which differ widely from one another with regard to the experiences of a patient and of a healthy subject, such as whether the head be large or small, the neck thin or thick, long or short, the bowels long or round, the chest and ribs broad or narrow, and there are very many other things, the differences between which must all be known, so that knowledge of the causes of each thing may ensure that the proper precautions are taken.