12. Bullock, T. H., “Properties of a Single Synapse in the Stellate Ganglion of Squid,” _J. Neurophysiol._ =11=:343-364 (1948) 13. Bullock, T. H., “Neuronal Integrative Mechanisms,” “Recent Advances in Invertebrate Physiology,” Scheer, B. T., ed., Eugene, Oregon:Univ. Oregon Press 1957 14. Hodgkin, A. L., and Huxley, A. F., “Currents Carried by Sodium and Potassium Ions through the Membrane of the Giant Axon of Loligo,” _J. Physiol._ =116=:449-472 (1952) 15. Hodgkin, A. L., and Huxley, A. F., “The Components of Membrane Conductance in the Giant Axon of _Loligo_,” _J. Physiol._ =116=:473-496 (1952) 16. Hodgkin, A. L., and Huxley, A. F., “The Dual Effect of Membrane Potential on Sodium Conductance in the Giant Axon of _Loligo_,” _J. Physiol._ =116=:497-506 (1952) 17. Hodgkin, A. L., and Huxley, A. F., “A Quantitative Description of Membrane Current and its Application to Conduction and Excitation in Nerve,” _J. Physiol._ =117=:500-544 (1952) 18. Lewis, E. R., “An Electronic Analog of the Neuron Based on the Dynamics of Potassium and Sodium Ion Fluxes,” “Neural Theory and Modeling,” R. F. Reiss, ed., Palo Alto, California:Stanford University Press, 1964 19. Eccles, J. C., _Physiology of Synapses_, Berlin:Springer-Verlag, 1963 20. Grundfest, H., “Excitation Triggers in Post-Junctional Cells,” “Physiological Triggers,” T. H. Bullock, ed., Washington, D.C.:American Physiological Society, 1955 21. Rall, W., “Membrane Potential Transients and Membrane Time Constants of Motoneurons,” _Exp. Neurol._ =2=:503-532 (1960) 22. Araki, T., and Otani, T., “The Response of Single Motoneurones to Direct Stimulation,” _J. Neurophysiol._ =18=:472-485 (1955) 23. Moore, G. P., Perkel, D. H., and Segundo, J. P., “Stability Patterns in Interneuronal Pacemaker Regulation,” _Proceedings of the San Diego Symposium for Biomedical Engineering_, San Diego, California, 1963 24. Eccles, J. C., _The Neurophysiological Basis of Mind_, Oxford:Clarendon Press, 1952 Fields and Waves in Excitable Cellular Structures R. M. STEWART _Space General Corporation El Monte, California_ “Study of living processes by the physiological method only proceeded laboriously behind the study of non-living systems. Knowledge about respiration, for instance, began to become well organized as the study of combustion proceeded, since this is an analogous operation....” J. Z. Young (24) INTRODUCTION