Stimulated By

[Stimulation is evidenced by a rise of blood-pressure, which disappears on section of the spinal cord below the medulla, and does not occur if the cord has been divided before the injection of the drug. This rule is only partially true, because subsidiary vaso-motor centres occur in the spinal cord itself.]

Irritants of motor centres, p. 176.

Salts of ammonium.

Potassium (?)

Caffeine (?)

Cicutoxine.

Delphinin.

Picrotoxin.

Strychnine.

Sanguinaria.

Ergot (cornutine).

Thebaine.

Convulsants.

Veratnne.

Belladonna (atropine). Hyoscyamus (hyoscyamine). Stramonium (daturine). Carbolic acid (?) Salicylic acid. Turpentine.

Camphor (rhythmically). Oil of rosemary, and other ethereal oils.

Digitalin (?) Ether (?) Chloroform (?) Chloral (?) Butyl-chloral (?)

Stimulant action doubtful; slight, and transient.

Depressed Or Paralysed By

[Depression is evidenced by fall in the blood-pressure not depending on failure of the heart's action. It is also shown by the absence of rise in blood-pressure on irritation of a sensory nerve.]

Carbolic acid.

Lobelia.

Large doses of most drugs, such as those in the adjoining column, which stimulate in small doses.

Depression usually occurs in the later stages of the action of such drugs even in moderate doses.