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



perature outdoors was that of moderate spring weather. 



A thermograph was placed in the basement about two-thirds of the dis- 

 tance from the boiler room to the front wall and about 6 feet above the base- 

 ment floor. It was located midway between two of the banks of steam pipes 

 but not immediately adjacent to them. Close beside the thermograph was 

 set a block of spruce wood 8x8x8 containing eight Uving termites in a small 

 cell in the center. The thermograph and the spruce block with its termites 

 were left in this position for the next 24 hours. 



At five points in the floor above a half-inch hole was bored and a ther- 

 mometer, run through a cork, was lowered through each hole. Readings 

 were recorded from these thermometers every hour during the following 24 

 hours. 



The remainder of the building continued in use throughout the treatment. 

 The administration offices served their usual purpose. Patients remained 

 in their rooms above without knowledge of the treatment going on in the 

 basement. 



Within an hour after the heat was turned on the temperature began to 

 rise, and this rise soon became rapid. By 9.30, or 3 1-2 hours after steam 

 was admitted, the temperature in the upper part of the basement area had 

 reached 120° F. Two hours later it had risen 15° further to 135° F. About 

 six o'clock the following morning it was necessary to shut off steam, in order 

 to make a sUght repair to the boiler. The temperature in the basement 

 promptly dropped to about 120° F. in the next 45 minutes, but when steam 

 was turned on it rose fairly rapidly again and by ten o'clock had regained 

 the high point of the earlier hours. At 4.00 p. m. the temperature began to 

 rise still further and when heat was finally turned off at 6.00 p. m., 24 hours 

 after the treatment started, the temperature had reached 140° F. 



The readings of the five thermometers were averaged and have been re- 

 duced to a curve indicated by the dash hne A in Fig. 5. The readings of 

 the thermograph are indicated in the dotted line B of Fig. 5. It will be 

 noted that the curve A runs higher than B, but it will be recalled that the 

 thermometers from which the record A is taken were nearer to the base- 

 ment ceiling than was the thermograph. 



When the treatment was concluded, the spruce block containing 8 ter- 

 mites was opened and all were found to be dead. In addition, they were 

 somewhat brown and brittle, as if they had Uterally been baked. 



After the heat treatment had been finished, the task of replacing and re- 

 pairing damaged woodwork on the main floor was carried out. Much of 

 the flooring had been taken up in searching for the termites and, as already 

 related, much of the studding had been cut off at the lower part. This work was 

 now carried further and flooring was replaced or renewed over a considerable 

 part of several rooms. In doing this the workmen took up and removed 

 many boards containing termite galleries and in a number of these there 

 were termites present. But all termites found were dead. No Uving termite 

 was found within this building in any subsequent work. 



In the basement new partitions were erected, built of tihng. As already 

 explained, the entire basement floor had been fully cemented. The walls of 



