Encloses certificate proposing Lord St John as FLS. Received visit from [Thomas] Velley; discussed his and [Samuel] Goodenough's joint paper on 'Fucus'. Praises second fasciculus of [John] Stackhouse's ["Nereis Britannica"], but criticises his plan to form several genera based on microscopic observations, as Hedwig did with mosses, as being too "minute & intricate for general observers"; his own proposed criteria for separating 'Fucus' genera. Chases up copies of his and Goodenough's paper and [James] Sowerby's "Fungi".