Summary A convenient laboratory method has been developed by which 80 to 90% of the pressor and oxytocic activities contained in frozen posterior lobes can be rapidly obtained in the form of a white, water-soluble, non-hygroscopic, stable powder possessing a pressor and oxytocic potency of 9 to 10 units per mg. In comparison with previous methods, desiccation of the glands with acetone and extraction of the residue are avoided; the ...