46 



COHESION. 



which it was held. I can show the effect 

 better in this bottle of water, and it is very 

 likely the whole bottle will go. [A 6-oz. vial 

 was filled with water, and a Eupert's drop 

 placed in it with the point of the tail just pro- 

 jecting out; upon breaking the tip off, the 

 drop burst, and the shock being transmitted 

 through the water to the sides of the bottle, 

 shattered the latter to pieces.] 



Fig. 13. 



Fig. 14. 



Here is another form of the same kind of 

 experiment. I have here some more glass 

 which has not been annealed [showing some 

 thick glass vessels ( n ) (fig. 14)], and if I take 

 one of these glass vessels and drop a piece of 

 pounded glass into it (or I will take some of 

 these small pieces of rock crystal they have 

 the advantage of being harder than glass) and 



