CAXADIAX FlHUEltlEii EXPEDITION, I'Jl'rlo 



249 



The velocity of the water was also measured in other parts of the tank. Fig. 

 34 shows the results of these measurements. It will be seen that the surface current is 

 insignificant, that at the bottom, however, being quite considerable. The water actually 

 moving towards the ice forms two currents, with a minimum of velocity between, the 

 upper current being directed towards the front of the ice, and the lower against its 

 underside, where the force of attraction appears to be very great. As a matter of fact, 



Fig. '6'6. — Movement of the water near the ice. 



the ice melts equally much on its lower side as on its face, and the rear i)ortion of the 

 ice diminished, at any rate to begin with, more rapidly than the front part, vide tig. 

 30. The greatest velocity of the water and the greatest acceleration found in any part 

 of the tank were localized about the lower side of the ice block. In the sea. where the 

 vertical extent of the ice is insignificant as compared with its horizontal extension, this 

 fact should probably be of the very highest importance. 



6551—20 



