NON-PROTOPLASMIC CELL CONTENTS 87 
acicular crystals. Sulfuric acid containing 5 mg. of selenous acid 
in each cc. gives with morphine sulfate a blue color changing to 
green and then to brown. 
_ CODEINE (CysH2,O;N.H,O), another alkaloid occurring in 
Opium, produces with sulfuric acid containing 5 cc. of selenous 
acid in each cc. a green color which changes rapidly to blue, 
then slowly back to green. 
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Fic. 50.—Codeine phosphate crystals from aqueous solution. X 120. 
CotcHicinE (C22H2 sO.N).—This alkaloid occurs in the corm 
and seeds of Colchicum autumnale. It is very abundant in the cells 
surrounding the fibro-vascular bundles of the corm. If a section 
of either corm or seed be treated with a mixture of 1 part of 
H.SO, and 3 parts of H2O, the cells containing colchicine will be 
colored yellow. If a crystal of KNO; then be added, the color 
will change to a brownish-violet. 
9, GLuCcO-ALKALOIDS (Alkaloidal glucosides).—These are 
compounds ‘ntermediate in nature between alkaloids and 
glucosides, having characteristics ofeach. To this group belongs 
solanine, a poisonous alkaloidal glucoside with a saponin-like 
action, which is found in the potato (Solanum tuberosum), in 
Solanum nigrum, Solanum Dulcamara, Solanum carolinense and other 
species of the Solanaceae. When sections of those plant parts 
