1851 Great Exhibition: Official Catalogue: Class X.: Alexander Hett
249. HETT, ALEXANDER, 24 Bridge St., Southwark - Preparer.
Variety of injected microscopic objects, showing the application of this mode of preparation, for displaying the structure of parts and organs, and also serving to illustrate the utility and importance of the microscope in itw application to the sciences of physiology and pathology.
Microscope to exhibit the objects.
[The injection of coloured substances into the minuter vessels of the animal frame is an art peculiar and difficult. Leuwenhoek succeeded perhaps better than any previous, and the majority of subsequent, observers, in preparing minute injections, many of which are still preserved as precious relics by the Royal Society. The injections employed consist of substances fluid when warm, and partially solidifying when cold. The apparatus employed is a powerful pump, the taper nozzle-piece of which is inserted into an artery.—R. E.]