NEUROHORMONES 171 



Twarog, Betty, 1954. Response of a molluscan smooth muscle to acetylcholine and 



5-hydroxytryptamine. /. Cell. Com p. Physiol. 44, 141-164. 

 Welsh, J. H., 1953. Excitation of the heart of Venus mercenaria. Arch. Exp. Path. u. 



Pharmakol. 219, 23-29. 

 Welsh, J. H., 1955. Neurohormones. The Hormones 3, 97-151. (Academic Press, New 



York.) 



Welsh, J. H., and Rae Taub, 1948. The action of choline and related compounds on the 



heart of Venus mercenaria. Biol. Bull. 95, 346-353. 

 Welsh, J. H., and Rae Taub, 1950. Structure-activity relationships of acetylcholine 



and quarternary ammonium ions. /. Pharmacol. Exp. Therap. 99, 334-342. 

 Welsh, J. H., and Rae Taub, 1951. The significance of the carbonyl group and ether 



oxygen in the reaction of acetylcholine with receptor substance. /. Pharmacol. 



Exp. Therap. 103, 62-73. 

 Welsh, J. H., and Rae Taub, 1953. The action of acetylcholine antagonists on the 



heart of Venus mercenaria. Brit. J . Pharmacol. 8, 227-iii. 



Whittaker, V. P., and I. A. Michaelson, 1954. Studies on urocanylcholine. Biol. Bull. 

 107, 304. 



