296 PROCEEDINGS OF THE AMERICAN ACADEMY 



7. This lead is derived from the interior of the bar. 



8. After the transmission of a certain amount of mercury, 

 and the return of this mercury to be passed again, the amount 

 transmitted in a given time attains a maximum. 



9. The amount passed in a given time with a given length 

 of the shorter leg of the siphon is dependent on the extent 

 of absorbing surface exposed to the mercury. 



10. The siphon action is limited by the same law that de- 

 termines the height or length of bar through which mercury 

 will pass. 



11. Mercury saturated with lead passes through leaden bars. 



12. The saturated bar is eminently brittle. 



13. The saturated bar contains 3.55 per cent, of mercury, 

 and 96.45 per cent, of lead. 



14. The bar saturated with, and afterwards withdrawn 

 from the mercury, lost in seven months, by atmospheric diffu- 

 sion, 2.75 per cent, of mercury, leaving only .80 per cent, in 

 the bar. 



15. In this condition the bar had nearly recovered its origi- 

 nal texture. 



16. After the loss of a certain amount by diffusion, the 

 surface becomes coated with crystallized amalgam, and the 

 diffusion ceases. 



17. The liquid amalgam contains 2.52 per cent. 



18. The saturated bar, long in contact with mercury, as- 

 sumes a crystalline texture, and cracks open. 



19. After crystallization commences, the progress of the 

 mercury is impeded. 



20. The specific gravity of tin is increased by saturation 

 with mercury. 



21. The saturated bar soon opens by numerous fissures pre- 

 senting crystalline angles and surfaces. 



22. The specific gravity of the crystalline amalgam is 

 greater than that of the bar nearly saturated with mercury. 



23. The velocity of transmission of mercury through tin 

 is at first slower than that through lead, but it differs in 



