There is a constitutional difference in the skin of different children in regard to retaining the animal heat manufactured within, so that some need more clothing than others for comfort. Nature is a safe guide to a careful nurse and mother, and will indicate, by the looks and actions of a child, when more clothing is needful. As a general rule, it is safe for a healthful child to wear as little clothing as suffices to keep it from complaining of cold. Fifty years ago, it was not common for children to wear as much under-clothing as they now do. The writer well remembers how girls, though not of strong constitutions, used to play for hours in the snow-drifts without the protection of drawers, kept warm by exercise and occasional runs to an open fire. And multitudes of children grew to vigorous maturity through similar exposures to cold-air baths, and without the frequent colds and sicknesses so common among children of the present day, who are more carefully housed and warmly dressed. But care was taken that the feet should be kept dry and warmly clad, because, circulation being feebler in the extremities, this precaution was important. It must also be considered that age brings with it decrease in vigor of circulation, and diminished generation of heat, so that more warmth of air and clothing is needed at an advanced period of life than is suitable for the young. These are the general principles which must be applied with modification to each individual case. A child of delicate constitution must have more careful protection from cold air than is desirable for one more vigorous, while the leading general principle is retained that cold air is a healthful tonic for the skin whenever it does not produce an uncomfortable chilliness. Sometimes it is asked, Why are women, especially young girls, so much more delicate and sickly than in former days? The true reply would be, it is because parents and teachers are doing every thing they can do to produce such mischiefs.