At a recent meeting of the American Zoological Society at New Orleans, Professor G. H. Parker '87, director of the Zoological Laboratories, reported the discovery of evidence of "hormone-like substances" circulating through the nerves at a very slow rate.
These substances have been known as "tropic impulses" for many years, but their nature has been entirely unknown. It was thought by many scientists that there were special "tropic" nerves which had to do with the nourishment of tissues. Professor Parker has shown by his experiments that these "hormone like substances" run in the opposite direction from ordinary nerve impulses at the remarkably slow rate of two centimeters a day, compared to about 25 meters a second for the ordinary impulses.
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