Where is the pathogenesis of Coffea to be found ? In Stapf's additions to the Materia Medica . From what is the tincture prepared, and what is the alkaloid of Coffea. From the unroasted beans of the Coffea Arabica . Caffeine , and it is similar to Theine or that found in tea. How is the tincture prepared ? One part of the best unroasted Mocha beans is coarsely powdered, moderately heated and macerated eight days with six parts of strong alcohol and then filtered. The residuum is then boiled down in a glass retort with 40 parts of distilled water, so far that its filtrate and the alcoholic extract mixed together make 10 parts, by weight. Drug power, 1/10. What is the general action of Coffea ? It produces a nervous erethism - over-sensitiveness, all the senses are rendered more acute, pains are felt intensely. What are grand characteristics of the drug ? 1. Great nervous excitement, excitation of mind and body.