OAP1LLABY ACTION. 



guincke has datennincd the surface-tension of a great many substances near 

 their point of fusion or solidification. His method was that of observing the 

 form of large drop Bt*ry* in g on a plane surface. If A" is the height of the 

 lUt miriaoe of the drop, and t that of the point where its tangent plane is 



s 'faff-Tenaotu cf Liquids at tfieir Point of Solidification. From, Quinc.k<. 



Quincke finds that for several series of substances the surface-tension is 



nearly proportional to the density, so that if we call (K-Kf= the specific 



9P 

 cohesion, we may state the general results of his experiments as follows : 



The bromides and iodides have a specific cohesion about half that of mercury. 

 The nitrates, chlorides, sugars, and fats, as also the metals, lead, bismuth, and 

 antimony, have a specific cohesion nearly equal to that of mercury. Water, 

 tl- carbonates and sulphates, and probably phosphates, and the metals, platinum, 

 p.l.l. silver, cadmium, tin, and copper have a specific cohesion double that of 

 ury. Zinc, iron, and palladium, three times that of mercury, and sodium, 

 six times that of mercury. 



