Report of the State Entomologist of Connecticut for the year ... . of logswere taken. Subsequent examination (see Figure 13) showed that normalcallous formation had occurred and the thermocouples were actuallyembedded in the cambium region. Therefore true subcortical temperatureswere registered. Subcortical and air temperatures were compared under a variety ofconditions. In one case, three logs containing thermo junctions were placedoutdoors on the north side of a building. A thermo junction surroundedby an open glass tube placed near the logs served to register air tempera-tures. By means of
Report of the State Entomologist of Connecticut for the year ... . of logswere taken. Subsequent examination (see Figure 13) showed that normalcallous formation had occurred and the thermocouples were actuallyembedded in the cambium region. Therefore true subcortical temperatureswere registered. Subcortical and air temperatures were compared under a variety ofconditions. In one case, three logs containing thermo junctions were placedoutdoors on the north side of a building. A thermo junction surroundedby an open glass tube placed near the logs served to register air tempera-tures. By means of a galvanometer the temperatures were noted at halfhour intervals. In another case a log and an air thermo junction wereplaced in an insulated chamber containing a quantity of dry ice. This 1 Terms as used by Payne (10). Connecticut State Entomologist 293 provided a rapid drop from room temperature (about 70° F.) to —10° readings were made at 10-minute intervals. In another test,several continuous records of air and log temperatures were Figure 13. Elm log showing callous growth over the point where thermo-junction was inserted. All of these tests support general conclusions which were well illustrated(Figure 14) by a single continuous 24-hour record of log and air tempera-tures made on February 26-27, 1940. The day was clear, and although I - I0°F
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