in Fluids. 399 



DESCRIPTION OF THE PLATES. 



PLATE III. 



FIG. 4. This figure represents a vertical section of 

 the apparatus used in the experiment No. 55 (see 

 page 341), in which an attempt was made to melt the 

 top of a projecting point of ice by Heat transmitted 

 downwards through olive- oil communicated by a solid 

 cylinder of iron, heated in boiling water. 



In this figure the tall glass jar (in the bottom of 

 which the cake of ice was frozen) is standing in an 

 earthen pan filled with pounded ice. 



The oil is also represented standing on the cake of ice 

 in the jar; and the iron cylinder in its sheath of paper 

 suspended in the axis of the jar in such a manner that 

 the lower end of this cylinder, which is flat, is directly 

 over the pointed projection of ice, and distant from it 



- of an inch. 



PLATE IV. 



Fig. 5. This figure shows the manner in which the 

 experiment No. 57 (see page 350) was made when pure 

 or fresh water in a glass jar was made to repose on brine, 

 or water saturated with sea-salt, without mixing with it. 



In this experiment the smaller jar, which contained the 

 brine, the pure water, and a quantity of olive-oil by 

 which the surface of the pure water was covered, stood 

 in a larger glass jar, which last stood in a shallow earthen 

 dish filled with pounded ice and water. 



