MOVEMENTS OF ADHERENT DROPS 



301 



even with the naked eye, or with a lens of low power, that 

 on the approach of the ether just the same phenomena of 

 streaming are set up in the drop which we formerly described 

 in detail for oil-drops, the tension of which had been lowered 

 at one spot by soap or something of the sort. The currents 

 are very violent, so that the eddies (A) arising on each side 

 are shown with great distinctness. When the drops flee 

 from before the ether, their edge, which is turned towards 



Ether 



Fig. 19. 



the ether, is at first rather straight, and later even concave, 

 and with this change in the shape of the edge changes in 

 the currents are also apparent, which modify the original 

 appearances to some extent. An actual movement away 

 from the ether arises most easily when the drops are very 

 shallow ; deeper drops show the streamings and the shrinking 

 back of the edge turned towards the ether most excellently, 

 but the movement not so well. 



If a more exact knowledge of the phenomena of streaming 

 within the drops be required, it is necessary to study the 

 relations existing in smaller drops under the microscope. 



