Note 4 — Replies.
Reading edition
Footnote 4:
(return)
[Having lately prepared this solution according to the formula given by Dr. Diamond (Vol. viii., p. 597.), in which it required 650 grains to dissolve the 60-grain precipitate, we were inclined to think our correspondent had formed a wrong calculation, as the difference appeared so little for a solution more than one-third stronger. We found upon accurately following Dr. Mansell's instructions, that it required 734 grains of iodide of potassium to effect a solution, whilst we have at the same time dissolved the quantity recommended by Dr. Diamond with 598 grains. This little experiment is a useful lesson to our correspondents, exhibiting as it does the constantly varying strength of supposed pure chemicals.—Ed. "N. & Q."]