Some of the same Spirit being poured upon Lapis Armenus, extracted from it a lovely and a deep blue, almost like a Solution of filings of crude Copper in the same Menstruum.
To conclude this Chapter I shall add, that tho' I have laid down these notes with what ex∣actness was possible, yet I question not, but that the Blood of several, and even of the same Animals is so different at different times, that were they to be tryed over again they would scarce have the same effects; yet it will not be a just reason to discourage others in further Tryals, since the advantage natu∣ral knowledge may attain by it, will be a suf∣ficient reward.