An instrument is described which employs a mercury current-integrator (Curtis Meter) in series with a thermistor and a mercury battery. This can be used to integrate temperatures at very precisely known localities even in thermally stratified habitats such as soil. The device has an overall accuracy of at least ?0.250C and can be read in the field without the need of delicate measuring equipment. In the paper a convenient method of calibration is described and some practical results are given to illustrate the effects of vegetation and of aspect as seasonal cycles of soil temperature. Pe3loMe
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Macfadyen et al. (1968) studied this question.