Alkaloid screening. VIII.

One thousand plant extracts were screened for the presence of alkaloids. The number of positive tests was 185 (18.5%). There are 107 new alkaloid-containing species.

Akaloid screening. VII.

One thousand and five plant extracts were screened for the presence of alkaloids. The number of positive tests obtained was 190, or 18.91%. There were 153 species found to contain alkaloids that are new to the literature. In the six previous communications (1-6) we have reported on the screening of 5,995 plant extracts for alkaloids. These extracts represented 4,888 species of plants, of which 1,336 gave positive alkaloid tests.

Alkaloid screening. VI.

One thousand and five plant extracts were screened for the presence of alkaloids. The number of positive tests obtained was 267, or 34.01%. New to the literature are 137 species. In the five previous communications (1-5) in this series we have reported on the screening of 4,990 plant extracts for alkaloids. These 4,990 extracts represented 4,103 species of plants, of which 1,069 gave positive tests.