List of ContributorsForewordPrefaceContents of Volume 2I. Preliminaries 1. Language Communication in Animals and in Man Hypotheses as to the Origins of Language The History of Ideas Underlying Thinking and Speech Language as a Function of the Brain Linguistics and Semiology The Inadequacy of Verbal Symbols as Tools of Thought The Future of Language References 2. The Concept of Language Differentiation The Nature of Language Relations and Computations Continuities as Proper Psychological and Physiological Correlates Linguistic Categories Are Relationships; They Are Definable Only Contextually Semantic and Syntactic Properties Have a Common Origin in Ontogeny Differentiation in the Growth of Vocabulary Conclusion References 3. Some Problems in Linguistic Theory 4. The Heuristic Principle in the Perception, Emergence, and Assimilation of Speech Psycholinguistic Rules and Plans Alternative Approaches ReferencesII. Natural History 5. A Zoologist's View of Some Language Phenomena with Particular Emphasis on Vocal Learning Introduction The Comparative Analysis of Vocal Communication The Role of Learning in Vocal Ontogeny Predispositions Brought to the Task of Vocal Learning The Origins of Vocal Learning Why Did Not Other Primates Learn to Speak? The Neural Substrate of Vocal Behavior Summary References 6. Brain Development in Relation to Language Shortcomings of Linguistic Analysis From Neurogenotype to Neurophenotype Functional Regulation in the Developing Cerebral Cortex Synaptic Stability and Lability Synaptic Disconnection, Reconnection, and Malconnection Conclusion References 7. Myelogenetic Correlates of the Development of Speech and Language Introduction Myelogenesis of the Visual and Acoustic Pathways Myelogenetic Correlates of the Development of Speech and Language Acknowledgements References 8. The Ontogeny of Cerebral Dominance in Man Introduction The Development of Handedness The Lateralization of Speech Specific Educational Backwardness Conclusions ReferencesIII. Ontogeny 9. Theories of Phonological Development Introduction Requirements for a Theory of Phonological Development Behaviorist Theories Structuralist Theories Natural Phonology Theory Prosodic Theory Conclusions Bibliography 10. Phonemicization and Symbolization in Language Development Introduction Crying Development of Phonatory-Articulatory-Auditory Mechanisms During the Period of Babbling as One Kind of Circular Reaction Reorganization of Babbling Phonatory-Articulatory-Auditory Mechanisms and Their Application to Language Development of Phonemicization and Symbolization References 11. Early Semantic Development in Child Language Introduction Context and Meaning of Early Utterances Performative Structures Optional Semantic Mechanisms Conclusion References 12. Grammatical Development-The First Steps The Nature of the Child's Early Utterances The Nature of Word Order Rules Word Classes Learning Mechanisms References 13. The Role of Cognitive Structures in Language Acquisition Introduction: Cognitive and Linguistic Development Cognitive Structures Representation Meaning Grammar Language Acquisition An Experimental Approach References 14.