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and insects could be under control. It was therefore decided to 

 erect a laboratory specially designed for carrying on work in ex- 

 perimental entomology. This Laboratory of Experimental Ento- 

 mology, or Insectary as it is conveniently termed, is an exceed- 

 ingly useful addition to the equipment of the department. It has 

 proven to be of even greater service than was expected at the time 

 it was built. We are now able to carry on many experiments, the 

 conducting of which would be impractical without it. 



A description of our insectary was published in Bulletin III. 

 of this station. Immediately the importance of the facilities of 

 such a building was recognized by other entomologists. And 

 since that time several of the experiment stations have made simi- 

 lar provisions for carrying on their entomological work. 



The Cornell Insectary , Plate XII, consists of a two-story cot- 

 tage with a conservatory attached. Upon the ground floor of the 

 cottage there are two laboratories for the entomologist and his as- 

 sistants, and a dark room for photographic purposes. In the 

 second story are quarters for a Janitor and a shop and store-room 

 for apparatus. In the basement there is a boiler for heating the 

 building and conservatory, conveniences for potting plants, a coal 

 cellar, and a cold-room for the storage of hibernating insects. 

 The conservatory, Fig. 4, is essentially the same as if constructed 

 for botanical purposes ; the foundations are of stone and brick, and 

 the superstructure, of iron, wood, and glass; it is supplied with 

 slate plant-tables at the sides, and with wooden tables in the centre. 

 It is divided by a transverse partition into two rooms, each 30 feet 

 in length. One of these is used as a hot-house, the other as a cold- 

 house. The slate tables along the sides of the conservatory are 

 covered with gravel ; here are kept the plants growing in pots, 

 and those breeding-cages from which water is allowed to drain. 

 While upon the wooden tables in the centre of the room are kept 

 the breeding-cages from which there is no drainage. 



In the equipment of the building special pains have been taken 

 to secure good apparatus for microscopic and photographic work. 

 Our outfit includes, besides other apparatus, a Zeiss microscope 

 with the new apoehromatic objectives, and a photo-micro camera. 

 The shop is furnished with a work-bench, and tools for use in 

 making and repairing apparatus ; and the conservatory is supplied 

 with the ordinary conveniences for a building of this kind. 



The cold-room for the storage of hibernating insects, referred 



