130 Mr. Chenevix on the Action, See. 
saying that he will return to the subject. From the labours of 
such persons some great and important fact must issue, and I 
hope that the present subject will not be excluded from their 
consideration. The facts contained in this Paper cannot be 
submitted to too severe a scrutiny ; and no judge can be more 
rigid or more competent than the very person who was the 
first to doubt my former experiments. But it is necessary to 
be observed by whoever shall think them worth the trouble of 
verifying, that even these experiments are liable to fail unless 
proper precautions are used : that I have never operated upon 
less than one hundred grains ; and that the results, which I 
have stated, however simple they may appear, have been the 
constant labour of some weeks. 
POSTSCRIPT. 
Since this Paper was written Dr. Wollaston has published 
some experiments upon platina. He has found that palladium 
is contained in very small quantities in crude platina. This fact 
was mentioned to me more than a year ago by Dr. Wollaston. 
I have not yet seen a copy of his Paper ; but I shall merely 
observe here that, whatever be the quantity of palladium found 
in a natural state, no conclusion can be drawn as to its being 
simple or compound. Nothing is more probable than that 
nature may have formed this alloy, and formed it much better 
than we can do. At all events the amalgamation to which 
platina is submitted before it reaches Europe is sufficient to 
account for a small portion of palladium. 
