BOTANIC MATERIA MEDICA, gt 
millimeters) thick, with several indentations 
where the stipe was inserted during its growing. 
Externally the root is of a dark brown color, 
with many glassy, transparent scales; internally 
it is spongy and of a pale green color. The 
taste is bitter and nauseous. It is said to con- 
tain six per cent. of a fixed of/ and a small per 
cent. of volatile o7/,; also resin, tannin, starch, 
gum, and filictc acid, whose formule is Gri, 
H,,, Os. The constituents are all said to be 
held in suspension by the oleoresin, which will 
be spoken of hereafter. Asa remedy in tape- 
worm it is highly valued, and given in doses of 
39 to 60 grains-(2 to 4 grams) in form of pow- 
der; very rarely used in this way, .the officinal 
preparations being Extractum Felicis, Liquidum 
Br. Phar., and the Oleoresina Aspidii, the dose 
of which is 5 to 15 M (0.3 to 1 gram). The 
adulteration by other species of ferns is not 
often practiced; the native species are smaller 
and with fewer scales, or with none at all, and 
possessing less of the coloring matter. 
Gelsemium, Gelsemium, Gelsemium semper- 
virens.—Natural order Loganacee. According 
to Professor Asa Gray, this is the false jasmine, 
the true variety belonging to the Olive family 
or order. (White jasmine). Yellow jasmine is 
_ aclimbing perennial plant, native of the South- 
ern United States, having shining opposite, 
ovate, lanceolate leaves, with minute stipules; 
flowers yellow and funnel-sha ed, with five sta- 
mens, bearing at their summits five arrow- 
shaped anthers; style long and slender with two 
stigmas. The rhizome, as it occurs in com- 
merce, is found either in long cylindrical pieces 
