"It was not, Monsieur, till after I had published in your journal, the second part of my experiments on the calces of mercury, that I became acquainted with Rey's book. I could not mention it in the very short enumeration I then gave of the different opinions on the cause of the increased weight of metallic calces; my fault, involuntary as it was, must be repaired, and to this end, I hasten to do justice to an author, who, by the profoundness of his speculations, has succeeded in assigning the true cause of that increase."