This work consists of fifteen plates, with six microscopical subjects on each plate, and is intended as a supplement to Dr. Lehmann’s admirable Manual of Physiological Chemistry. The English reader already possesses a translation of this work by Dr. Day, published by the Cavendish Society. The publication of this Atlas will not only be acceptable to those who possess that work, but to all who are interested in microscopical chemistry. A reference to Dr. Lehmann’s work will clearly show that there are many products of great interest in the blood and secretions of the human body which, although they have a complicated chemical structure, are yet easily recognised by means of the microscope. A knowledge of the forms which these substances assume will be easily acquired by means of the present Atlas. These illustrations, however, are not confined to chemical compounds, but wherever particular conditions of the solids or fluids of the body have been referred to by Dr. Lehmann, needing the microscope for their elucidation, they have been given by Dr. Funke. The plates are lithographed, and, wherever colour is required, it has been done from the stone, and we may point to them as good examples of what may be accomplished for the illustration of microscopic objects by these processes.