The Four Transverse Magnetic Effects in Copper: New Measurements.

-1. Pale bands produced by the cutting of bundles of nerves in the pectoral fins of Mustelus canis may be either full and regular in outline or tortuous, restricted and irregular in form. 2. Regular bands occur in dogfishes that are blanching and are excited by a concentrating lipohumor acting unimpeded. 3. Irregular bands occur in dogfishes that are darkening and are the result of the antagonism between the dispersing hydrohumor intermedin and a concentrating lipohumor from the nerves. 4. The blood from a darkening Mustelus shows evidence of containing intermedin to a functional degree; that from a blanching one shows no such evidence. 5. The formation of a pale band by the unopposed action of the lipohumor takes place in less time (6.5 to 9.5 minutes) than it does when this action is opposed by that of intermedin (13 to 18 minutes).