Do not be too hasty in supposing that everybody is endowed with a zeal for astronomy equal to your own. The average man or woman does not enjoy being called out from a warm fireside on a winter's night, no matter how beautiful the celestial sight to be seen. Your friend may politely express interest, but to tempt him to this is merely to encourage a habit of untruthfulness. The cause of astronomy is not likely to be furthered by being associated in any person's mind with discomfort and a boredom which is not less real because it is veiled under quite inadequate forms of speech. It is better to wait until the other man's own curiosity suggests a visit to the telescope, if you wish to gain a convert to the science. When observing in the open be sure to wrap up well. A heavy ulster or its equivalent, and some form of covering for the feet which will keep them warm, are absolute essentials. See that you are thoroughly warm before you go out. In all probability you will be cold enough before work is over; but there is no reason why you should make yourself miserable from the beginning, and so spoil your enjoyment of a fine evening. Having satisfied his craving for a general survey of everything in the heavens that comes within the range of his glass, the beginner is strongly advised to specialize. This is a big word to apply to the using of a 2-1/2- or 3-inch telescope, but it represents the only way in which interest can be kept up. It does no good, either to the observer or to the science of astronomy, for him to take out his glass, have a glance at Jupiter and another at the Orion nebula, satisfy himself that the two stars of Castor are still two, wander over a few bright clusters, and then turn in, to repeat the same dreary process the next fine night. Let him make up his mind to stick to one, or at most two, objects. Lunar work presents an attractive field for a small instrument, and may be followed on useful lines, as will be pointed out later. A spell of steady work upon Jupiter will at least prepare the way and whet the appetite for a glass more adequate to deal with the great planet. Should star work be preferred, a fine field is opened up in connection with the variable stars, the chief requirement of work in this department being patience and regularity, a small telescope being quite competent to deal with a very large number of interesting objects.