A UTORADIOGRAPHIC LOCALIZATION OF THE ACETYLCHOLINE-STIMULATED SYNTHESIS OF PHOSPHA TIDYLINOSITOL IN THE SUPERIOR CERVICAL GANGLION

provide significant protection without intolerable side effects,4 and orally effective antagonists of the circulatory deconditioning to be expected during long space flights.' If better drugs cannot be found or created, the success of the program within the allotted time may be facilitated by placing a physically and professionally qualified flight surgeon aboard so as to provide for intravenous administration of existing antiemetic, analeptic, radio-protectant, or vasopressor drugs, and for unpredictable emergency measures when required. Thus, it may be possible to meet contingencies that would otherwise jeopardize the success of the early Gemini, MOL, and particularly Apollo missions, pending the development of more effective engineering and pharmacological protection for human subjects on such flights. Summary.-An appropriate selection of drugs presently available may provide an important contribution to the success of the early Gemini, Apollo, and MOL missions. Such selection could be made in simulation experiments now under way or planned for the near future. A first approximation of such a program is presented.