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3 Monnier, M. and Hatt, A. M.: Intraventricular infusions in acute and chronic rabbits. Application of the stereotaxic method of Monnier and Gangloff. Pflügers Arch. ges. Physiol. 317: 268-277 (1970). 4 Monnier, M. and Hatt, A. M. : New evidence of humoral transmission of sleep. Experientia 27: 722 (1971). 5 Monnier, M. and Hatt, A. M.: Humoral transmission of sleep. V. New evidence from production of pure sleep hemodialysate. Pflügers Arch, ges Physiol. 329: 231-243 (1971). 6 Monnier, M.; Hatt, A. M.; Cueni, L. B., and Schoenenberger, G. A.: Humoral transmission of sleep. VI. Purification and assessment of a hypnogenic fraction of ‘ sleep dialysate ’ (factor delta). Pflügers Arch. ges. Physiol. 331: 257-265 (1972). 7 Monnier, M. and Schoenenberger, G. A. : Some physical-chemical properties of the rabbit’s ‘ Sleep hemodialysate ’. Experientia 28: 32-33 (1972). 8 Pappenheimer, J. R.; Miller, T. B., and Goodrich, C. A.: Sleep promoting effects of cerebrospinal fluid from sleep deprived goats. Proc. nat. Acad. Sei., Wash. 58: 513-517 (1967). 9 Schoenenberger, G. A.; Cueni, L. B.; Hatt, A. M., and Monnier, M.: Isolation and physical-chemical characterization of a humoral, sleep inducing substance in rabbits (factor ‘ delta ’). Experientia 28: 919-921 (1972). 10 Schoenenberger, G. A.; Cueni, L. B.; Hatt, A. M., and Monnier, M.: Humoral transmission of sleep. VII. Isolation and physical-chemical characterization of a ‘ sleep inducing factor delta ’. Pflügers Arch. ges. Physiol, (in press).