6 N. H. AGR. EXPERIMENT STATION [Bulletin 204 



well as wings. They emerge suddenly in large numbers from the colony 

 and include both males and females. After flying a few yards or, at most, 

 a few rods, they alight and such pairs as survive the flight settle down to 

 found new colonies. The wings are promptly broken off near the body. 

 This annual flight serves to spread the species, to avoid overcrowding and 

 to found new colony groups. 



Studies in Termite Control. 



The data presented in this publication are concerned in general with the 

 measures adopted to eradicate termites from an occupied public building 

 in New Hampshire and to protect the building from further infestation, and 

 in particular with the use of heat as a means of killing termites within timbers 

 and floors. 



The building in which the infestation was discovered is a modem hospital 

 located in one of the cities of New Hampshire. The structure is divided 

 into three principal parts: a central portion, a wing to right and another 

 to left. The wings are connected to the central portion by corridors. The 

 outer walls are built of stone and brick. Some inner walls, as indicated 

 on the plans, are of brick. Most of the inner partitions, however, are wood 

 studding, plastered. 



The central portion of the structure is used in part for administration pur- 

 poses. On the first floor are an office, waiting room, matron's room, doctors' 

 room and a service wing. Above these are private rooms for patients. The 

 basement of this part of the structure is fitted up for store rooms, laundry 

 and boiler room. 



Corridors forty feet long connect the administration building with the 

 men's pavilion to the south and the women's pavilion to the north. These 

 corridors have brick walls and at the place where each corridor enters the 

 administration building, as well as the place where it enters the pavilion, 

 there is a brick cross-wall with a fire door. The two pavilions are sub-divided 

 into wards and private rooms, the partitions being of wood. 



The hospital is located on a large plot of ground at the edge of the city 

 in question. It has ample space of lawns all about it. There are some 

 trees. South of the building there was situated, at the time that these studies 

 began, a frame house and the remnants of a frame barn, both of them built 

 many years ago. 



The hospital is maintained in scrupulous order and every measure is adopt- 

 ed for hygienic cleanliness that may be found in any well-regulated institution 

 of its purpose. Both the buildings and the equipment are modern and com- 

 plete. 



In the spring of 1917 a number of insects, which undoubtedly must have 

 been winged termites, were observed by the hospital officers emerging from 

 a crack under a door-sill in the opening leading from the corridor of the ad- 

 ministration building into a room that was, at that time, used as a dispensary, 



