249 



Strong Aqueous Hy- \ 

 drocyanic Acid, 



5 measures V 



Caustic Soda Solution, I 



1 measure / 



Cyanide of Mercury H- faint 



Ferrocyanide of Po- 

 tassium 



Sulphocyanide of Po- 

 tassium -+ 1 



Oxalic Acid -* 2 



Oxalate of Ammonia ... H- 3 

 Acid Oxalate of Potash ... -+ 3 

 Neutral Oxalate of Potash -+ 4 



Formic Acid -+ 5 



Acetic Acid -t- 3 



Acetate of Potash -+ s 



Acetate of Soda n- 3 



Acetate of Baryta n- 2 



Acetate of Uranium -f faint 



Acetate of Zinc -j- 4 



Acetate of Lead -* 1 



Acetate of Copper H- l 



Tartaric Acid -f 5 



Monotartrate of Potash . -}- 3 



Bitartrate of Potash -+ 5 



Bitartrate of Soda -* 3 



Tartrate of Potash and 



Soda -+3 



Tartrate of Potash and 



Antimony _$. 3 



Citric Acid -i- 4 



Succinic Acid -- 4 



Gallic Acid n- 2 



Pyrogallic Acid ~+ 4 



Carbazotic Acid -- 4 



Benzoic Acid. . . . . H- 2 



Numerous interesting phenomena of motion and of colour, especially 

 with solutions of salts of the earth-metals and with metallic iodides, 

 were observed during the examination. 



36. On examining these numerous results we find : 1st. That all 

 alkalies and some alkaline salts produce a positive flow only. 2nd. 

 That some alkaline and many neutral salts produce both positive and 

 negative flows. 3rd. That some neutral and many acid salts, 

 and nearly all acids, both organic and inorganic, produce a negative 

 flow only. The stronger influence of acids, compared to that of 

 alkalies (14, Note) in the production of these movements, is pro- 

 bably the reason why various salts of alkaline reaction give a negative 

 as well as a positive flow, and why many neutral salts containing a 

 strong acid (chlorides, for example) give a negative flow only. No 

 substance of alkaline reaction has been observed to give a negative 

 flow only, nor any strongly acid substance to give only a positive 

 flow. An alkaline or electro-positive substance as the electrolyte, 

 produces therefore by the 3rd method a positive flow, and an acid 

 or electro-negative substance produces a negative flow. Numerous 

 analogies may be detected in the behaviour of similar salts on ex- 

 amining the Table. 



37. The movements obtained by the 3rd method appear to be 



