Conductivity and Electrolysis of 'Chemical Compounds, 439 



effect of capillarity and bubble-tension on the exit of the air 

 through the final orifice. 



It was found from experiment that these forces were very 

 nearly equivalent to a pressure of 22 millims. The depth of 

 the exit-orifice under the surface of the water over which the 

 air was collected had, of course, to be allowed for. 



The experiments gave the following results : — 



Temperature 20° C. 





Pi-Pv 



t. 



(Pi-Ps)*-*- 



MPi-p 2 )t- 



( 



I. < 



< 



millim. 



+ 15 



76 



157 



303 



513 



656 



852 



1205 



3945 

 719 

 344-5 

 180-5 

 105 

 81 



61-75 

 43-6 



59175 

 54644 

 54086 

 54691 

 53865 

 53136 

 52611 

 52538 



-4531 



- 558 

 + 605 



- 826 



- 729 



- 518 



- 73 



■( 



200 

 400 

 600 

 800 

 1000 



426-5 

 2095 

 139 . 

 103-6 



82 



85300 

 83800 

 83400 

 82933 

 82000 



-1500 



- 400 



- 467 



- 933 



f 

 III.« 



200 

 400 

 600 

 800 

 1000 

 1200 



563-6 

 278 . 

 184-6 

 137-3 



108 

 89 



112733 

 111200 



110800 

 109866 

 108000 

 106800 



-1533 



- 400 



- 934 



-1866 

 -1200 



The approach to equality in the amounts in column 3 shows 

 that the time varies nearly in the inverse ratio of the difference 

 of pressures. The gradual diminution of the number in that 

 column visible, on the whole, shows that this law is slightly 

 deviated from, and that the time diminishes somewhat more 

 rapidly than the reciprocal of the pressure — a conclusion which 

 is at variance with the results arrived at by Bunsen for the 

 passage of gases through porous plugs. 



LX. On the Electric Conductivity and Electrolysis of Chemical 

 Compounds. By Dr. L. Bleekrode. 

 [Concluded from p. 389.J 

 7. Electrolysis of some simple Carbon Compounds, 



I HAVE here put together a few compounds in which the 

 carbon present is in a simple relation to the other element. 

 They are all liquid at ordinary temperatures, with the excep- 



