R. A. Hatcher[11] states that it is possible that cactus grandiflorus, under certain conditions, may contain a principle with a strychnin-like action. But Hatcher made ten experiments on frogs, four on cats, six on dogs, two on rabbits, and one on a guinea-pig, with Cactina pillets of the Sultan Drug Company and the Cactin of the Abbott Alkaloidal Company. From 1 to 15 pillets in frogs and up to 25 in dogs were used at each dose. In no single instance was there any evidence of a digitalis-like or strychnin-like action, or, in fact, of any decided action of any kind whatever. [11] The Journal A. M. A., Sept. 21, 1907, pp. 1021-1024. Gordon Sharp[12] was unable to obtain either alkaloid or glucosid from the plant, but found a series of resins that caused contraction of the blood-vessels of a frog. This was not a digitalis-like contraction, but depended, he believed, on simple acidity. On the heart of the frog the resins have little or no effect, comparisons being made with digitalis in the same animals. There is no proof that cactus grandiflorus itself shortens diastole, or in fact, that it has any special action on the heart muscle at all. Sharp experimented on himself with large doses of an extract made with alcohol 1 to 5, but got no noticeable results. He thinks that the plant may have some slight diuretic action. [12] Practitioner, London, 1894, iii, 444-446. Sayre submitted the preparation which he used in his experiments for more careful testing to E. M. Houghton, who reported that it had practically no action on the heart. In commenting on Houghton’s results, Reid Hunt said that they were confirmed by his own experiments. He did not deny, however, that the drug might have some therapeutic effect and that, in very large doses, it did affect the kidneys. S. A. Matthews[13] found one preparation of cactus (cactin--Abbott) absolutely inert so far as any effect on the heart is concerned. He found that cactina (Sultan Drug Co.) in very large doses depressed both the circulation and respiration. In this regard it differs from strychnin, and it has no resemblance to the action of digitalis, strophanthus or any of the heart stimulants. A dose of from 10 to 12 pillets administered intravenously to a 10 to 12 kg. dog exerted little or no influence on the heart or circulation; the larger dose may cause a slight fall in blood-pressure. When 70 or more pillets were administered within two and a half hours the animal generally died. [13] The Journal A. M. A., March 21, 1908, pp. 956-958. The work of Boinet and Boy-Teissier also has been criticized by Hatcher on the ground that their most positive results were obtained with an alkaloid which no one at this day is able to prepare. The results quoted in this report, however, were obtained by the use of extracts of cactus so that it does not seem that they should be entirely rejected, whatever their value may be. CLINICAL EVIDENCE