This volume contains the papers read at the Conference on Language and Language Behavior held at the University of Michigan's Center for Research on Language and Language Behavior in October 1966. Papers are ordered under the following topics: First Language Acquisition in Natural Setting, Controlled Acquisition of First Language Skills, Second Language Learning, Linguistic Structures Above Sentence Level, Phonology and Phonetics, and Language Impairment. Among the papers are: Edward S. Klima, "Knowing Language and Getting to Know It"; Ursula Bellugi, -Linguistic Mechanisms Underlying Child Speech"; James J. Jenkins, "Thought and Language"; Richard Ohmann, "Mentalism in the Study of Literary Language"; John B. Carroll, "Word-Frequency Studies and the Lognormal Distribution"; John F. Hemdal, "Some Simple Rules for Self-Adaptive Mechanical Recognition of Vowels"; Alexander Z. Guiora,""An Exploration of Some Personality Variables in Authentic Pronunciation of a Second Language"; Evan Keislar, "Improving Language Performance of Young Children: A Progress Report"; Ronald S. Tikofsky, "Contemporary Issues in Aphasia"; and Harold Goodglass, "A Psycholinguistic Study of Agrammatism." (FWB)