Upon the development of the enamel in certain osseous fish

The author has shown in previous communications to the Royal Society (which are to be found in its ' Transactions ’) that notwithstanding the fact that in all the vertebrata enamels present tolerably close resemblances in chemical, physical, and histological characters, differences far more considerable than might have been expected exist in the formative processes. The present communication seeks to establish an additional method of enamel formation, essentially differing from any which has hitherto been described, and whilst the investigation was undertaken in the hope of bridging over the gaps which exist between the methods previously known, it has only partly succeeded in doing so, as the process to be described stands somewhat alone.