Note 151 — RESEARCH I. (continued 3)

I have no doubt but that the gas procured from the solution of gold in aqua regia, is analogous to that produced from platina.

Some very uncommon circumstances are attendant on the solution of platina:

1st. The immense quantity of acid required for the solution of a minute quantity of platina.

2d. The great quantity of gas produced during the solution of this minute quantity.

3d. The intense red color of the solution, and its perfectly acid properties after it ceases to act upon the metal.