"Using comparative and developmental approaches he examined dorsal root ganglion cells in the embryos of 18 vertebrate species, and adults of 56 species—using a variety of histological stains, particularly those of Golgi, Cajal, and Ehrlich. A year after it was published, Bardeleben wrote, 'without fear of contradiction, one can say that there has never been such a comprehensive work on the ganglia of the brain and spinal cord' " (Larry W. Swanson).