Studies on the Organizer Problem in Pelmatohydra Oligactis: II. The Effect of Some Respiratory Inhibitors and Stimulants and of Oxygen Deficiency on the Induction Potency of the Hypostome

Abstract

1. The induction ability of the hypostome of Pelmatohydra oligactis is not drastically modified by respiratory stimulants or inhibitors such as methylene blue, potassium cyanide, lithium chloride and sodium fluoride, under experimental conditions. 2. A pretreatment with methylene blue may confer induction power on the normally inactive subtentacular implant. 3. Induction does not seem to be closely linked to the cyanide-sensitive respiratory system. 4. Oxygen is possibly of secondary importance only in the initial act of induction. Its absence, however, inhibits the further development of an induced bud.