Encloses comments from [Samuel] Goodenough on [John] Lightfoot's 'Fucus' specimens, showing that Lightfoot's work on this genus was "almost always guesswork". Expects a battle with Goodenough over 'Fucus repens' and its right to be called a species; observations. [John] Stackhouse's "accuracy & industry" in investigating marine plants, in reference to 'F. repens'. Long character description and observations on 'F. repens'.