As regards the season, this is more extended than that of the butterflies. A few species of moths may give you a call during the bleak nights of October and November, and also during the somewhat less dismal nights of February and March; but from April to September you may rely on a goodly number of captures. Of course you will not expect many of the 'rarities' and 'gems' to find you out; these are to be searched for in the open field in the manner to be presently described; but your lights will attract a large number of the commoner species of _Geometrae_ and _Noctuae_, the former _chiefly_ during the early summer, and the latter more or less throughout the season. A little experience will show you that the atmospheric conditions form a very important consideration. The dark and warm nights are the most productive. Very little luck is to be anticipated when the full moon is throwing down her silvery rays from a clear sky; nor will you see many while a cold east or north-east wind is blowing. Under these conditions many moths prefer to keep in the sheltered nooks where they slept away the sunny hours of the day. They love a warm and moist air such as calls forth the odours of the fragrant blossoms that provide their sweets, and show no dislike to a fine drizzling rain that you yourself would prefer to avoid. A pelting shower will generally keep them under cover, but they delight in the fresh and moist air that immediately succeeds the passing storm. [Illustration: FIG. 50.--FRAME OF NET FOR COLLECTING INSECTS ON LAMPS AND WINDOWS.] If you reside on the outskirts of a town an occasional tour of inspection of street lamps may add a few specimens to your collection, and some entomologists attach so much importance to the value of these luminaries that they provide themselves with a special net for the removal of moths from the glass and rails (fig. 50). The straight side marked _a_ is applied to the panes of glass when flutterers or settlers are to be taken, and the bend on the opposite side is to secure those that rest on the rail. Such a frame is easily made by bending a piece of stout wire to the required shape, and then soldering it to a ferrule to receive a long stick. The net itself should not be deep. Many different forms of traps are now made for catching moths, and these are deservedly coming rapidly into favour. They are generally constructed on a 'catch-'em-alive-oh' principle, and have the advantage that, after having been set, they may be left alone all night without any watching, and give an ambitious collector the opportunity of taking insects in his garden and searching in the open field both at the same time.