From verso of the card: "The red arrows in the picture show the danger points at which gas may enter; these must be sealed as instructed below. Cracks in ceilings and walls should be filled in with putty or pasted over with paper. Cracks between floor boards, round the skirting or where pipes pass through the walls should be filled in with pulp made of sodden newspaper. All ventilators and fireplaces should be stopped up with paper or rags. Windows should be wedged firmly to keep them tight, the frames sealed round with gummed strip or paper, and any broken panes boarded in or pasted over with strong paper. The cracks round doors should be covered with stout paper and the keyhole plugged."