At the firefly-shops the captured insects are sorted as soon as possible, according to the brilliancy of their light,--the more luminous being the higher-priced. Then they are put into gauze-covered boxes or cages, with a certain quantity of moistened grass in each cage. From one hundred to two hundred fireflies are placed in a single cage, according to grade. To these cages are attached small wooden tablets inscribed with the names of customers,--such as hotel proprietors, restaurant-keepers, wholesale and retail insect-merchants, and private persons who have ordered large quantities of fireflies for some particular festivity. The boxes are despatched to their destinations by nimble messengers,--for goods of this class cannot be safely intrusted to express companies.
Great numbers of fireflies are ordered for display at evening parties in the summer season. A large Japanese guest-room usually overlooks a garden; and during a banquet or other evening entertainment, given in the sultry season, it is customary to set fireflies at liberty in the garden after sunset, that the visitors may enjoy the sight of the sparkling. Restaurant-keepers purchase largely. In the famous Dōtombori of Ōsaka, there is a house where myriads of fireflies are kept in a large space enclosed by mosquito-netting; and customers of this house are permitted to enter the enclosure and capture a certain number of fireflies to take home with them.
The wholesale price of living fireflies ranges from three sen per hundred up to thirteen sen per hundred, according to season and quality. Retail dealers sell them in cages; and in Tokyo the price of a cage of fireflies ranges from three sen up to several dollars. The cheapest kind of cage, containing only three or four fireflies, is scarcely more than two inches square; but the costly cages--veritable marvels of bamboo work, beautifully decorated--are as large as cages for song-birds. Firefly cages of charming or fantastic shapes--model houses, junks, temple-lanterns, etc.--can be bought at prices ranging from thirty sen up to one dollar.
Dead or alive, fireflies are worth money. They are delicate insects, and they live but a short time in confinement. Great numbers die in the insect-shops; and one celebrated insect-house is said to dispose every season of no less than five _shō_--that is to say, about one peck--of dead fireflies, which are sold to manufacturing establishments in Osaka. Formerly fireflies were used much more than at present in the manufacture of poultices and pills, and in the preparation of drugs peculiar to the practice of Chinese medicine. Even to-day some curious extracts are obtained from them; and one of these, called _Hotaru-no-abura,_ or Firefly-grease, is still used by woodworkers for the purpose of imparting rigidity to objects made of bent bamboo.