16 ' Mr. G. Gore on the Development of Dynamic Electricity 



68. Diphosphate of Soda. — 4 ounces of spring water and 100 

 grains of diphosphate of soda; hot metal positive. Retried with 

 distilled water and the liquid pre-boiledj same result, but in a 

 less degree. Liquid exhibited weak alkaline reaction with test- 

 paper. 



69. Hyposulphite of Soda. — 4 ounces of distilled water and 

 100 grains of hyposulphite of soda, pre-boiled; hot metal posi- 

 tive. Retried after absorption of some atmospheric air; same 

 result, but in a greater degree. Liquid neutral to test-paper. 



70. Sulphate of Soda.- — 4 ounces of distilled water and 100 

 grains of sulphate of soda, solution pre-boiled ; hot metal nega- 

 tive. Retried after absorption of a little air; same result. 

 Neutral to test-paper. 



71. Chloride of Sodium. — 4 ounces of distilled water and 100 

 grains of chloride of sodium, pre-boiled; hot metal positive. 

 Retried after absorption of air ; same result. Neutral reaction 

 with test-paper. 



72. Nitrate of Soda. — 4 ounces of distilled water and 100 

 grains of nitrate of soda, pre-boiled ; hot metal positive. Retried 

 liquid after it absorbed some air ; same result. Neutral to test- 

 paper, 



73. Microcosmic Salt. — 4 ounces of distilled water and 100 

 grains of microcosmic salt, pi'e-boiled; hot metal positive. Re- 

 tried after absorption of air; same result. Liquid exhibited 

 alkaline reaction. 



74. Bitartrate of Soda. — 4 ounces of distilled water and 100 

 grains of bitartrate of soda, pre-boiled ; hot metal very feebly 

 positive. Retried several times with similar results. Acid 

 reaction. 



75. Solutions of chloride of barium, nitrate of baryta, chloride 

 of strontium, nitrate of strontia, chloride of calcium, sulphate of 

 magnesia, and chloride of magnesium, were also similarly prepared, 

 and each examined several times; and the results obtained, 

 although uniform, and confirmatory of all previous ones, were so 

 minute in degree, and affected by such slight circumstances, that 

 I have thought it unadvisable to publish them. 



76. Sulphate of Alumina. — 4 ounces of distilled water and 50 

 grains of sulphate of alumina, pre-boiled; hot metal negative. 

 Retried after exposure to air; same result. Liquid acid to 

 litmus-paper. 



77. Sulphate of Zinc. — 5 oimces of spring water and 100 

 grains of sulphate of zinc ; hot metal negative. Acid reaction 

 with litmus-paper. Retried with distilled water, and the solu- 

 tion pre-boiled ; same result. Weak acid reaction. 



78. Sulphate of Copper. — 5 ounces of spring water and 110 

 grains of sulphate of copper; hot metal negative. Retried 



