The resemblance is further sustained by a broad belt of elevated plains, 'ranging from 1200 to 1700 ft., **which s** The upper Bukhtarma valley in the Sailughem range of the Altai system appears to belong to the same type.

If we adopt Thiele's view that each band is accompanied by a second branch for **which s** has negative values the complication is still further increased, but there does not seem to be sufficient reason to adopt this view.

Consider an elementary couple of two metals A and B for **which s** has the values s and s" respectively, with junctions at the temperature T and T+dT (absolute), at which the coefficients of the Peltier effect are P and P+dP. Equating the quantity of heat absorbed to the quantity of electrical energy generated, we have by the first law of thermodynamics the relation dE/dT =dP/dT+(s' - s").