1. Children of the two sexes differ very little in the character of their respiratory movements.
2. Between girls and women and boys and men there is little or no difference in respiratory type.
3. Childbearing does not permanently affect respiration.
4. The natural type of respiration, for both sexes is one in which the movement is fairly equally balanced between chest and abdomen, the abdominal being somewhat in excess.
5. In typical unconstricted individuals the chest contributes about the same bulk of air as does the abdomen.
6. Constricting dress causes preponderance of thoracic movement in ratio to its restriction of abdominal movement and to the sensitiveness of the nervous co-ordination.