ON IMPACT WITH A LIQUID SURFACE. 



197 



level, their presence in the lower position being again due to the slower convergence 

 of the liquid sheath. 



When we came to experiment with rough spheres falling 75 centims. into pure 

 glycerine, the first photographs obtained were figs. 2 and 3 of Series XXVII., here 

 given, which correspond very closely with figs. 2 and 3 of Series IX. of the former 

 paper, obtained when a similar sphere fell 60 centims. into water. But when we 

 adjusted the timing sphere so as to obtain earlier stages, expecting such a figure 

 as No. 1 (which was actually taken from a water splash with 14 centims. fall), 

 we obtained instead such figures as 1, 2, and 3 of Series XXVIII. , in which the fall 



Series XXVIII. 



Fig. 1. 



Fig, 2. 



Fig. 3. 



Fig. 4. 



was the same, viz., 75 centims. Being convinced that the extreme fringe of the 

 crater in fig. 2, Series XXVII., could only have been projected at a very early stage, 

 we made repeated experiments to discover the cause of the contradiction, and found 



