. The Biological bulletin. Biology; Zoology; Marine biology. THE ACTION OF ERGOTAMINE ON THE CHROMATO- PHORES OF THE CATFISH (AMEIURUS NEBULOSUS) Z. M. BACQ1 {From the Marine Biological Laboratory, Woods Hole, Mass.) It is a well-known fact that ergotamine paralyzes the action of adrenalin and the effects of sympathetic stimulation. But ergotamine has also a definite action on the denervated cells, and this action, as far as it has been investigated, is the same as that of adrenalin. Thus ergotamine, in the cat, increases the rate of the denervated heart (Cannon and Bacq, 1931), contracts the

. The Biological bulletin. Biology; Zoology; Marine biology. THE ACTION OF ERGOTAMINE ON THE CHROMATO- PHORES OF THE CATFISH (AMEIURUS NEBULOSUS) Z. M. BACQ1 {From the Marine Biological Laboratory, Woods Hole, Mass.) It is a well-known fact that ergotamine paralyzes the action of adrenalin and the effects of sympathetic stimulation. But ergotamine has also a definite action on the denervated cells, and this action, as far as it has been investigated, is the same as that of adrenalin. Thus ergotamine, in the cat, increases the rate of the denervated heart (Cannon and Bacq, 1931), contracts the  Stock Photo
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. The Biological bulletin. Biology; Zoology; Marine biology. THE ACTION OF ERGOTAMINE ON THE CHROMATO- PHORES OF THE CATFISH (AMEIURUS NEBULOSUS) Z. M. BACQ1 {From the Marine Biological Laboratory, Woods Hole, Mass.) It is a well-known fact that ergotamine paralyzes the action of adrenalin and the effects of sympathetic stimulation. But ergotamine has also a definite action on the denervated cells, and this action, as far as it has been investigated, is the same as that of adrenalin. Thus ergotamine, in the cat, increases the rate of the denervated heart (Cannon and Bacq, 1931), contracts the denervated nictitating mem- brane (Rosenblueth, 1932 and personal observations), contracts the retractor penis muscle (Bacq, 1933), excites the secretion of the dener- vated sweat glands (Frohlich and Zak, 1932 2), increases the blood pres- sure after complete sympathectomy (Bacq, Brouha, and Heymans, 1932).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-; Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report; HighWire Press. Lancaster, Pa. [etc. ] : Lancaster Press, inc. [etc. ]