Where light is wanted yet the sun’s rays must be kept out, of cellar or
room, the best way is to mix whitewash and ordinary blue, coating the
window with this inside. When afraid of sun-rays on the head remember
not only to protect the head itself but also the nape of the neck and
the spine. A thick pleat of something in the lining of the coat or
shirt and high collar are very necessary in order to guard these nerve
centres both from excessive cold and heat.