Another most important reason for not wearing long dresses on the street is that they stir up the dust and collect microbes, and thus contribute materially to the dissemination of the germs of disease and subject the wearer and her family to the risk of infection. The question of clothing takes an important place in the hygiene of the lungs. All clothing may be approved which is sufficiently warm, and which allows of modifications according to the variations in the temperature, and does not hinder the movements of the body, and particularly those which are carried out by the respiratory muscles. In the first place, it is very important that the muscles about the shoulders should have perfect freedom of motion, in order that the expansion of the apices of the lungs should not be interfered with. Clothes which hang heavily on the shoulders, and especially those which grasp the neck tightly, are unsuitable. Special attention must be given to this point in the selection of winter clothing. In going up long flights of stairs furs and heavy top coats should be taken off and carried over the arm; this will prevent much shortness of breath and gasping when one reaches the top of many flights. =The Winter Street Dress.=—The street dress for winter should be warm enough to prevent a feeling of chilliness, and yet be light enough to prevent the wearer from becoming overheated while walking, or from feeling a sense of weight of the clothing, which is always a sign of being too warmly clad. For outside coats impregnated woolen materials, waterproof, but at the same time porous, are the best, except in very heavy rains. A storm coat of some kind should complete the costume for rain or snow. The woman should never stay indoors on account of very cold or inclement weather, as being housed up and the lack of sufficient exercise make one very susceptible to the very sudden changes for which our climate is so notable. FOOTNOTES: [7] See pages 337 and 339. CHAPTER IX PHYSICAL TRAINING THE KEY TO HEALTH AND BEAUTY