of letters can be hired to teach in Kalgan. This is the natural gate to Mongolia, the place to study the language, and to purchase the requisite outfit for travelling in the interior. The missionaries living there are always glad to help those who may come, in preparing to serve Christ in the great North-West. If Mongolia had as many missionaries as China in proportion to its population, there should be twenty instead of ten. The field is difficult, the task is arduous. Workers of heroic courage are needed. Let us hope that many may enter through this "Open Door."