ig{) ON THE WATER IN MURIATE OF AMMONIA- 



with a double wick; and afterward the heat was applied to 



the-naked retort. In about ten minutes moisture appeared 



in the neck, and continued to accumulate, so that a dew 



covered a space of about two inches in length, and uniteH 



into small globules. At the end of the experiment the 



salt was found to be sublimed entirely into the upper part 



of the body of the retort, and the curvature ai its neck. 



This repeated This experiment was repeated under different forms. In 



in different one) the two gasses were combined in small successive 



ys * , portions in the upper part of a long glass tube over dry 



quicksilver. The combination being completed, the tube, 



which had such a degree of curvature towards the middle of it, 



that, when placed horizontally, its extremity could be kept 



immersed in quicksilver, was turned over into this horizontal 



position, and ignited charcoal was placed around part of it, 



so that heat was communicated to its closed extremity, where 



the salt was collected, sufficient to volatilize it. Moisture 



in this <jase also was condensed on the sides of the tube. And 



in all the experiments, which were performed, sensible 



quantities of water were obtained*. 



Exposure of I next repeated the experiment in another form. The salt 



the salt to the was f orm ed by the combination of the passes in the retort, or 



air/or 15' had . - , . , i t» • . • , 



no effect on ' n the tube as before. Uut previous to applying heat to it, 

 the result, jt was left exposed for fifteen minutes to the air. The ex- 

 tremity of the neck of the retort or of the tube being then 

 immersed in quicksilver, heat was applied as,before, and as 

 nearly as possible in the same manner, and to the same ex- 

 tent. The condensation of moisture was soon apparent, but 

 the quantity was not greater, so far as could be estimated, 

 than was obtained from the salt heated without having been 

 exposed to the atmosphere. This exposure therefore, when 

 the other circumstances of the experiment were the same, 

 had no influence on the result. 

 Ixperimentto I next proceeded to ascertain by more direct experiment, 



ascertain, whether the 6alt does attract any moisture or not from the 

 whether the ; \ 



atmosphere. A glass bottle of the capacity of six cubic 



* A Tew of the words toward the close of this paragraph were 60 

 obliterated by the seal, that it was necessary to supply them by con- 

 jecture. C. 



inches 



