Apr. 1922] STUDIES in termite control 19 



direction or directions thej' were spreading toward the building. In fact, 

 the condition seemed rather to be that the ground was pretty well infested 

 in almost every direction. 



The probability is that there were, and are, pieces of board and other 

 bits of wood scattered through the ground here and there over much of the 

 area, since a good deal of it represents a fill made by the contractors in grading, 

 after the hospital was built. Odd pieces of board and other bits of wood 

 were buried in the process of grading. 



Very large numbers of termites were disclosed by the traps in the area 

 back of the root cellar (Fig. 3, L.). A large, flat board was placed on the 

 ground here. This was turned over every day and the termites found were 

 killed with boiling water. Thousands were destroyed. By using boiling 

 water instead of Phinotas oil at this place the ground was not rendered un- 

 suitable for the termites and they continued to come to the board trap. 



It was felt that there was danger that the termites would construct galleries 

 over the concrete and stone posts to the lattice work or flooring of the porches. 

 Also,. at the inclines (Fig. 3, A. A.), where concrete had been substituted for 

 the wooden parts next to the ground, it was feared that galleries might be 

 constructed to reach the wood. In order to forestall this, a band of tree 

 tanglefoot was applied around the brick posts of the porches beneath the lat- 

 tice work and a similar band around the concrete supports for the entrance 

 In other places where it was feared that galleries might be constructed, tangle- 

 foot was used in the same fashion. In no case were termite galleries dis- 

 covered. The bands were kept fresh by combing out at frequent intervals. 



Three seasons have now elapsed since the control work was begun. The 

 closest possible watch has been kept for termites within the administration 



Fig. 5. Graph of temperature records. The dash line A is the average 

 of thermometers lowered through floor. The dotted line B is the thermo- 

 graph record. 



