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A small stove consumes more oxygen than twenty men at rest. It may also produce poisonous carbon monoxide. Common prudence requires adequate ventilation while a stove is in operation. If snow is too loose to cut into blocks for constructing bivouacs and igloos, it can frequently be consolidated by thoroughly tramping an area, first with skis, then with boots. But this is hard work. Fir and pine boughs are an excellent substitute for air mattresses and even sleeping bags in emergencies. They can be used, not only on the snow floor, but also as a lining on the sides and roof. The thicker and denser the |
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