A Treatise on Domestic Economy; For the Use of Young Ladies at Home and at School

of feeling, while the power of motion continues; and so, on the other hand, the nerve of motion may be divided, and, the nerve of sensation remaining uninjured, the power of feeling is retained, and the power of motion is lost. In certain nervous diseases, sometimes a limb loses its power of feeling, and yet retains the power of motion; in other cases, the power of motion is lost, and the power of sensation is retained; and in other cases, still, when a limb is _paralysed_, both the power of motion and of sensation are lost. Now, the nerves, like all other parts of the body, gain and lose strength, according as they are exercised. If they have too much, or too little, exercise, they lose strength; if they are exercised to a proper degree, they gain strength. When the mind is continuously excited, by business, study, or the imagination, the nerves of feeling are kept in constant action, while the nerves of motion are unemployed. If this is continued, for a long time, the nerves of sensation lose their strength, from over action, and the nerves of motion lose their power, from inactivity. In consequence, there is a morbid excitability of the nervous, and a debility of the muscular, system, which make all exertion irksome and wearisome. The only mode of preserving the health of these systems, is, to keep up in them an equilibrium of action. For this purpose, occupations must be sought, which exercise the muscles, and interest the mind; and thus the equal action of both kinds of nerves is secured. This shows why exercise is so much more healthful and invigorating, when the mind is interested, than when it is not. As an illustration, let a person go a shopping, with a friend, and have nothing to do, but look on; how soon do the continuous walking and standing weary! But suppose one, thus wearied, hears of the arrival of a very dear friend: she can instantly walk off a mile or two, to meet her, without the least feeling of fatigue. By this is