the Thermo-Electric Properties of Liquids. 529 



of acid chromate of potassium acidified with chromic acid (see No. 

 35) ; with platinum, gold or palladium, in solution of carbonate of 

 sodium (see Nos. 39, 40, 41) ; with gold or palladium in carbonate of 

 potassium (Nos. 71, 72) ; also with platinum in potassic hydrate (No. 

 108. See also No. 112). 



B. — In the Bent-tube Apparatus. 



In the experiments with this apparatus, the solution in the cup B 

 was at the atmospheric temperature, viz., from 55° to 65° F., and that 

 in cup C was raised to between 190° and 200° F., rarely beyond, by 

 keeping the water in the outer cistern at a boiling temperature. The 

 solutions were not deprived of dissolved air previous to the experi- 

 ments, because the presence of air had been found to have very little 

 effect. 



No. 111. The solution of acidulated cupric bromide of No. 105. 

 Platinum ribbons. Cold metal positive 63°. (Compare No. 105°.) 



, No. 112. 14 oz. water and \ oz. of pure potassic hydrate. Hot pla- 

 tinum positive 5° at 200° F., and 31° by persistent continuance of 

 heat. (Compare Nos. 87, 108, 142, and 149.) 



Remarks. This result proves that the great increase of the current 

 by continuance of beat in Experiment No. 108 was not entirely due to 

 the influence of the washers. 



No. 113. 14 oz. of water and 4 oz. of crystals of cupric sulphate. 

 Hot platinum positive 3°. (Compare Nos. 15, 42, 43, and 44.) 



No. 114. The solution of chloride of manganese of Nos. 73 and 74. 

 Cold platinum positive 39°. No signs of chemical change. (Compare 

 No. 73.) 



No. 115. 14 oz. of water, and \ oz. of pure sulphuric acid. Cold 

 platinum positive 33°, but diminished to 10 by prolonged heat. (Com- 

 pare No. 7.) 



No. 116. 14 oz. of water, and 1 oz. of the same acid. Cold pla- 

 tinum positive 7 ', and decreased at 200° F. 



No. 117. 14 oz. of water, and 2 oz. of the same acid. Coid platinum 

 positive 2^°, and decreased at 200° F. (Compare Nos. 115 and 116.) 

 Remarks. In these three last experiments the magnitude of the current 

 decreased with the increase of amount of acid present. 



No. 118. 13 oz. of water, and 7 J oz. of a saturated solution of pure 

 carbonate of sodium. Hot platinum positive 10$°. (Compare Nos. 4 

 and 39.) 



No. 119. The mixture of nitric acid and water of No. 28. Cold 

 platinum positive 47^°. (Compare No. 28.) 



No. 120. The solution of chloride of cobalt of No. 58. Cold platinum 

 positive 36°. (Compare No. 58.) 



No. 121. The solution of potassic carbonate of No. 70. Hot pla- 



