CHAPTER V. CLOTHING, AND WHAT TO WEAR. No clothing actually creates

warmth of itself--The varying powers of clothing to detain air in its meshes--Two or three layers of clothing always warmer than a single garment equal to their combined thickness--The transmission of the body-heat to the clothes--The different fabrics are either good or bad conductors of heat--Permeability of clothing to air--The vegetable kingdom; the properties of cotton and of linen--The animal products; the properties of silk and of wool--Wool one of the best materials to wear next the skin--Recommendations for wearing woollen under-garments --The way to prevent them from shrinking--The modern pyjamas immensely superior to the old-fashioned bed-gown--The clothing would be modified according to the season of the year.