The writing activity of the century's tidal scientists are shown in the graph. The scientists formed three distinct networks: the early, synthetic network; the later, harmonic network; and the network formed in America. The very first bump in the 1820's is the last effort of gold-diggers applying to the residual Board of Longitude. Then the first and largest peak is caused by Lubbock's receipts, which is followed immediately by peaks instigated by Whewell. Their combined effort is sustained throughout the 30's, merging into the work of Airy which dominated the 40's. The singular peak in the late 40's is caused by the ill-fated Fairy experiment.

The main peaks of the 50's are activity in America. Further activity in America, for the remainder of the century, is absent from the graph owing to my lack of continued research in the National Archives, Washington.

The rise toward the end of the 70's is owing to Thomson, and the dramatic rise to the second highest peak is owing to Darwin, who had completed his tidal work by the century's end. The public row between Thomson and Roberts at the end of the 1870's shows clearly.