Report of the State Entomologist of Connecticut for the year ... . 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. c t $ 9 io ii a. z \_± I I III I I I J L ***^,1ta«ii«wli Ah«liiBrt****IWfllWMW Figure 14. A 24-hour continuous record of air (jagged line) and log (smootherline) temperatures. the log was in the sun until 3 :10 P. M
Report of the State Entomologist of Connecticut for the year ... . 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. c t $ 9 io ii a. z \_± I I III I I I J L ***^,1ta«ii«wli Ah«liiBrt****IWfllWMW Figure 14. A 24-hour continuous record of air (jagged line) and log (smootherline) temperatures. the log was in the sun until 3 :10 P. M., the side containing the thermo-junction was directed away from the sun. In the illustration (Figure 14) 1 The writers are indebted for these records to Dr. Raymond H. Wallace, of the University olConnecticut, whose duplex recording galvanometer was used. 294 Connecticut Experiment Station Bulletin 472 the air temperature is represented by the lower, very irregular line, thereference point (32° F.) being indicated by the horizontal broken line. Thelog temperature is represented by the upper, smoother curve, and itsreference point (32° F.) is indicated by the horizontal continuous line. At7 A. M., when the air temperature registered about 16° F., the subcorticaltemperature coincided with the air temperature within two or three the forenoon the air tem
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