After a decade of field and greenhouse tests, a variety of techniques harnessing the absorptive power of plants'roots appear poised for a much expanded role.
2.
In 1858, Balfour Stewart described his experiments on the thermal radiative emissive and absorptive powers of polished plates of various substances, compared with the powers of lamp-black surfaces, at the same temperature.
3.
These yielded a remarkable extension of Pierre Pr�vost's " Law of Exchanges, " and enabled him to establish the fact that radiation is not a surface phenomenon, but takes place throughout the interior of the radiating body, and that the radiative and absorptive powers of a substance must be equal, not only for the radiation as a whole, but also for every constituent of it.
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