The most general form of the differential equation for the linear conduction of heat is given by The solution of this equation with the conditons: can be obtained by the method given in my previous paper (2nd Series, Vol. 10, p. 507 of this Journal) in the form: The same method can be applied to the case in which the conditions are given by Since K≠0 at both ends, μs can be determined from the equation When Zs(x) satisfies the relations: when Zs(s) is normalized, the solution is The differential equation in the case of wind drift when the effect of floating ice pieces are taken into account must be solved under the boundary conditions: This problem can be solved by the same method
As a whole, the bad catch may be resulted by the abundance of rainfall during the anadromous period. The above relation on April and May at Tohoku-and Kwanto-district is recognized more clearly than that on the other months, and on February and March at Sikoku-and Kyushu-district. The great amount of the precipitation in the hatching period has a tendency to give the good catch of the fish in the next year.
One of the most important but troublesome problems of the measurement of earth-current is how to minimize the so-called “Electrode's Effects”. The writers have studied one of them, the c. e. m. f. produced by the current passing through the various kinds of soil and propose a method to refrain this effect from the measurement of earth-potential.