Ever since the behavioral work of Lissrnann (1958), who showed that the weak electric discharges of some families of fish (hitherto considered useless for prey capture or for scaring away enemies) are part of a strange sensory system, these fish have attracted attention from biologists. The subsequent discovery of the electroreceptors in the skin of gymnotids and mormyrids (Bullock et al. 1961; Fessard and Szabo 1961) and the evidence that the ampullae of Lorenzini of nonelectric sharks and rays are also electro- receptors (Digkgraaf and Kalmijn 1962) was a start for a lively branch of...

As a source of information on neuroanatomical research methods this Volume is not without precedent. In 1957, at the initiative of Dr. W. F. Windle, a conference was held at the National Institutes of Health, the proceedings of which, edited by Dr. Windle and published by C. C. Thomas under the title "New Research Tech niques of Neuroanatomy," rapidly became something like a standard reference in the field of Neuromorphology. The present editors were emboldened to seek support for a second expose of contemporary research methods in Neuroanatomy by the success of this earlier publication, as...