J. D. Thompson plans to write JH about problem of positioning tide gage in dockyard. Admiral [Patrick Campbell] may move it to end of jetty. RW suggests omitting night observations in winter; jetty dangerous in bad weather. Will soon be ordered home. Amused by JH's report on Ascension [Island] sulfur. Sorry to hear Mary Herschel is ill. RW's son William is well again, but weak.