456 Mr. G. Gore on the Propei-ties of 



of the liquid, by change iu air, 1"94; by fusion, 3"098; total 

 loss, 5 "038 per cent, 



5G. Small pieces, either of gray or changed antimony, im- 

 mersed in fused nitrate of ])otash, rose to the surface by the aid 

 of the evolved gas when approaching fusion, and burned with 

 great evolution of heat and formation of antimoniatc of potash. 

 No particular cifcct occurred by rubbing together unchanged an- 

 timony powder and pulverized chlorate of potash. 

 57. Contrast of the two varieties : — 



Gray variety. 

 Spccifie gravity : 

 6-369 to G-673. 



Uiicliaugcd (lark variety. 

 Specific gravity : 

 5-739 to 5-944. 



Colour : 



Polished steel. 



Fracture : 



Amorphous. 



Texture : 



Soft and weak. 



Relative electric condition : 

 Positive. 



Relative thermo-electric state 



Colour : 



Silver-gray. 



Fracture : 



Crystalline. 



Texture : 



Hard and stronr/. 



Relative electric condition : 

 Negative. 



Relative thermo-electric state '• 



Positive. I Negative. 



58, It M'ould be interesting to inquire, to what force or mode 

 of physical action is the evolution of heat iu antimony due ? If 

 it is caused by some new mode of physical action, then the force 

 causing it will of course differ, in some respects, from all other 

 forces, and will be found to manifest itself in a number of sub- 

 stances and not in antimony alone, like heat, electricity, magnet- 

 ism, &c. ; and will also be found, like each of them, to be cor- 

 relative with, and convertible into, other natural forces. 



Birmingham, November 19, 1857, 



[Since the publication of this paper, the author, in a second 

 communication to the Royal Society (dated June 1, 1858)^ has 

 given the following additional information respecting this sin- 

 gu.lar substance.] 



The change observed in it is shown not to be an exercise ot the 

 force of cohesion, because the amount of heat evolved by the powdered 

 metal is not sensibly diifercnt from that set free by the substance iu 

 its coherent massive state. 



The thermic discharge is not limited to a particular temperature, 

 but commences between 1/0° and 190° Falir., and increases in rapi- 

 dity to some point above 212° Fahr., when it becomes sudden. 



The heat may be discharged either suddenly or gradually, accord- 



