30 



Arthur B. Lamb 









X^-^ 



^ -^y // I /' ''\v\\ vv^rx- :>--_■ 



Fig. I Lines of force between unlike magnetic poles. Repulsion. 



^X ^ 



^ 1 ' 





o 







Fig. 2 Lines of flow between oppositely pulsating bodies. Attraction. 



It is this exact reversal of sign of hydrodynamic action at a dis- 

 tance, as compared with electric and magnetic actions, which 

 makes this force peculiarly applicable to the case of mitotic figures, 

 obviating many objections which beset the previous explanations, 

 and particularly the fact that with previously considered polar 

 forces if one made an assumption which would explain the form 

 of the field, the ??iotion of the centrosomes appeared contradictory 



