(Received 21 May 1973; accepted 21 November 1973)
Published Online: July
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Relatively few phytochemical studies have been conducted on very old samples of Cannabis sativa L., particularly leaf and stem material [1–4]. At least one article  has shown that the fluid extract of marihuana is stable for as long as 40 years. A more recent article  reports on the stability of cannabinoids in stored plant material at different temperatures.
Der Marderosian, AH
Professor of pharmacognosy, Philadelphia College of Pharmacy and Science, Philadelphia, Pa.
Research fellow, Temple University Hospital, General Clinical Research Center, Philadelphia, Pa.
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