PAPER BY PROF. OBERBECK. 197 



to the first approximation, and which will bring about a corresponding 

 change in the formula for pressure. 



In other words, by a series of approximations-one seeks the true so- 

 lution in a manner similar, for instance, to that used in the computation 

 of mutual inductive effects of two conductors, in which computation we 

 imagine the total influence developed into a series of individual influ- 

 ences of the first conductor upon the second and then again of the sec- 

 ond upon the first, and so on. It is easy to foresee that the further pro- 

 longation of the computation must afford a corresponding term in the 

 expression for the pressure. By this means the expression for the ro- 

 tatory motion will suffer some chauge ; still it is to be seen that the or- 

 der of magnitude of this is already correctly established. After the 

 execution of the further computations just indicated, I expect then to 

 elaborate in a similar manner the average distribution of pressure in 

 summer and in winter in order to determine more precisely the changes 

 of the rotatory motion with the seasons. The formula above found is 

 only to be applied with caution to the northern hemisphere, since in 

 this hemisphere the fundamental condition that the temperature is a 

 function of the geographical latitude applies much less truly than in 

 the southern hemisphere. 



