64 



Dr. G. Gore. 



Exp. 27. — Small tubes each 14 millims. high, one 5 millims. bore, 

 and the other 15 millims. Lower liquid 1 volume of sulphuric acid to 

 2 of water, coloured ; the upper one consisted of 1 volume of sulphuric 

 acid and 20 of water. Battery strong, current from broad to narrow 

 tube. In two minutes a line appeared in narrow tube about 2 millims. 

 above red liquid ; the liquid rose a little in the tube. Remarks. — Ex- 

 periments Nos. 24, 26, and 27 show that it is difficult to obtain the 

 definite line with liquids which differ only in strength. 



Exp. 28. — Lower liquid a saturated solution of cupric nitrate ; 

 upper one, dilute sulphuric acid 1 in 8. Current from broad to narrow 

 tube. Two lines developed in narrow tube 3'0 millims. asunder ; the 

 upper one concave and the lower one flat. No line produced in 

 broad tube. Reversed current, lines in narrow tube disappeared, and 

 the meniscus became diffused. Two lines developed slowly in broad 

 tube 1*75 millim. apart, the upper one concave in weakest part of the 

 red liquid ; the lower one flat, and merged after a while into the other. 



Exp. 29. — Lower liquid same as in last experiment; upper one 

 dilute nitric acid, 1 volume of acid to 5 of water. Current from broad 

 to narrow tube. Free conduction. A straight line developed in 

 narrow tube in about forty-five seconds. Reversed current, a line 

 commenced to appear in broad tube in about seven minutes, and was 

 fully developed in about four minutes more. Reversed again. Straight 

 line developed in narrow tube in about four minutes ; it quickly be- 

 came concave, and the liquid rose in that tube as if moving in the 

 direction of the current. 



Exp. 30. — Lower liquid a saturated solution of sodic carbonate, 

 coloured by litmus; upper one dilute solution of the same salt, viz., 

 1 oz. of the saturated solution and 12 ozs. of water. Current from 

 broad to narrow tube. Conduction very feeble, though battery was 

 strong. No line produced in either tube. Liquid in narrow tube 

 sank and became weaker in colour and diffused ; that in the broad 

 tube rose slightly and became less diffused. The mass of the liquid 

 appeared to move in a direction opposite to that of the current. 



Exp. 31. — Lower liquid a saturated solution of potassic cyanide, 

 coloured by litmus ; upper one, 1 oz. of the same salt in 12 ozs. water. ' 

 Current from broad to narrow tube. Conduction feeble. An im- 

 perfectly developed line produced in narrow tube. The coloured 

 liquid sank in the narrow tube as if moving opposite to the current. 

 Liquid surface was less definite in the broad tube than in the narrow 

 one. 



Exp. 32. — Lower liquid, equal volumes of nitric acid and water, 

 coloured ; upper one, 1 volume of nitric acid and 10 of water. Both 

 meniscuses convex. Current from broad to narrow tube. Free con- 

 duction. Imperfectly developed line in colourless portion of liquid in 

 narrow tube in four minutes, 2 millims. above the red liquid. The 



