On Mount Everest, as we now know, most of these dangers will be less than on any of the other very high mountains in the Himalaya. Also there are no difficulties in the approach to Mount Everest from India. In this respect it differs from such peaks as K^2 and others. As a rule the highest mountains in the Himalaya always lie far back from the plains in the main chain, beyond the foot-hills and the intervening ranges. To approach them from the South in India, weeks of travel are often necessary, up deep gorges, and over rivers, where it is next to impossible to take baggage animals. Fortunately the approach to Mount Everest by the route from Darjeeling to Phari Dzong and thence over an easy pass into Tibet avoids all these difficulties. In Tibet a high tableland, averaging 13,000 feet, is reached. Travelling in Tibet, North of the main range of the Himalaya, is entirely different from that on the South of the range. Instead of deep-cut gorges, a rolling, bare, stone-covered country exists, over which it is easy to take baggage animals, the only obstacle being the rivers that sometimes are not bridged, and are often swollen by the melting snow. From Kampa Dzong to Tingri Dzong, the base of operations for the Expedition, is an open country. Mount Everest lies 40 to 50 miles South of Tingri Dzong; the approach also is without difficulty. The ascent of Mount Everest was not the primary object of the Expedition of 1921. A mountain the size of Mount Everest cannot be climbed by simply getting to it and starting the ascent immediately. A reasonable route has to be discovered to the summit; which usually can only be done by a complete reconnaissance of the mountain. This has been admirably done, and a most magnificent series of photographs has been brought back by the members of the Expedition. Mount Everest consists of a huge pyramid, having three main aretes, the West, the South-east, and the North-east. It is the last, the North-east arete, that is obviously the easiest, being snow-covered along most of its length. Nowhere is it excessively steep, and nowhere are there precipices of rock to stop the climber. We now know that it can be reached, by means of a subsidiary ridge, from a col 23,000 feet, the Chang La, that lies to the north of the North-east arete. This col was the highest point on Mount Everest reached by the Expedition, and had it not been for savage weather a considerably higher altitude would have been attained; for above the col for several thousand feet lay an unbroken snow-slope. It was only after much hard work, and over two months' exploration, that a route to this col was discovered. As is usually the case even with mountains far smaller than Mount Everest, it can be seen that if a point, often a long way below the summit, can be reached, not much farther difficulty will be encountered. But the puzzle is, how can that point be arrived at from below?