The book gives an account of results obtained from experiments where grafts of neuronal, glial and other tissues as well as artificial materials were placed into the spinal cord. It attempts to evaluate the contributions made by these studies to our understanding of basic neurobiologies questions. These include factors that regulate neuronal growth during development as well as regenera tion following injury to the nervous system. The model of neural transplanta tion is also useful for the study of cell-to-cell interactions, and this applies to interactions between glial cells and neurones,...