This is a short collection of some curious Alchemical treatises which was republished by A.E. Waite in 1893. According to the preface, Waite found these in a manuscript belonging to a collector of occult books. This etext uses Unicode to display astrological symbols (here used in an alchemical sense, of course).
found on sacred-texts.com, the Collectanea Chemica contains writing on the philosopher’s stone, the immortal liquor called Alkahest, the oil of sulphur among other things.