Osazone (glucazone) crystals

Needle-shaped crystals of the carbohydrate derivative osazone (glucazone) with other crystal forms viewed by microscope.

Figure from the manuscript version of the paper “The glucoside constitution of proteid matter” by Frederick Charles Pavy, Proceedings of the Royal Society of London, vol.54 (1893), pp.326-330.

Inscribed above in ink: ‘Microphotographs of osazone crystals derived from albumen sugar, after the application of Landwehr’s copper precipitation process to the non-reducing product. Magnified about 400 diameters’.

Frederick William Pavy (1829-1911) British physician and physiologist was elected a Fellow of the Royal Society in 1863. He was an authority on diabetes.