14 Mr. G. Gore on the Development of Dynamic Electricity 



47. Oxalic Acid. — 4 ounces of distilled water and 100 grains 

 of oxalic acid, solution pre-boiled ; hot metal negative. 



48. Acetic Acid. — 4 ounces of distilled water pre-boiled, and 

 \ of an ounce of strongest liquid acetic acid added ; hot metal 

 negative. 



49. Tartaric Acid. — 4 ounces of distilled water and 100 grains 

 of tartaric acid, liquid pre-boiled ; hot metal negative. 



50. Citric Acid. — 4 ounces of distilled water and \ of an ounce 

 of aqueous solution of citric acid, liquid pre-boiled ; hot metal 

 negative. Retried the same liquid after it had absorbed some 

 atmospheric air ; same result, but in a less degree. 



51. Ammonia. — 4 ounces of spring water and \ of an ounce 

 of strong aqueous solution of ammonia ; hot metal positive. 



52. Carbonate of Ammonia. — 4 ounces of distilled water and 

 100 grains of sesquicarbonate of ammonia, the solution pre-boiled 

 a short time to expel dissolved air, and to partly convert the salt 

 into bicarbonate ; hot metal negative. 



53. Sulphate of Ammonia. — 4 ounces of distilled water and 

 100 grains of sulphate of ammonia, solution pre-boiled; hot 

 metal negative. Retried after absorption of some atmospheric 

 air ; same result, but in a less degree. The solution exhibited 

 feeble acid reaction with litmus-paper. 



54. Hydrochlorate of Ammonia. — 4 ounces of spring water and 

 100 grains of hydrochlorate of ammonia; hot metal feebly posi- 

 tive. Same solution pre-boiled ; the hot metal was negative. 

 Retried with distilled water and the solution pre-boiled; hot 

 metal was feebly negative below 200° F., — above that, feebly 

 positive. Tried the same liquid after absoi'ption of some atmo- 

 spheric air ; the hot metal was then feebly negative, increasingly 

 to 180° F., then decreasingly to 208° F. I finally reboiled it ; 

 the hot metal was then in a greater degree negative, increasingly 

 to 200° F., then decreasingly to 208° F. The solution was very 

 feebly acid to litmus-paper. These results well exhibit the inter- 

 ference of the impurities of spring water in a liquid of feeble action. 



55. Nitrate of Ammonia. — 4 ounces of distilled water and 100 

 grains of nitrate of ammonia, solution pre-boiled; hot metal 

 negative. Retried after absorption of some atmospheric air; 

 same result, but in a less degree. Liquid was feebly acid to 

 litmus-paper. 



56. Caustic Potash. — 4i ounces of spring water, containing 

 100 grains of anhydrous potash dissolved in it, solution pre- 

 boiled ; hot metal positive. 



57. Carbonate of Potash. — 4 ounces of spring water and 100 

 grains of carbonate of potash ; hot metal positive. Retried with 

 solution prc-boilcd ; same result. Tried again with distilled 

 water and liquid pre-boiled ; same result. 



