Received Smith's letter from [William] Young; pleased to hear he is still prosecuting his favourite study; Smith's paper to the [Natural History] Society gave great pleasure. He is about to commence his medical studies. Asks if the aquatic lichen he sent Smith has been determined yet; he has found it in great quantities in Lanarkshire growing with 'Tremella verrucosa'.; found 'Tremella nossoc'. Small sketch and description of an unidentified "thing" he recently gathered on the shore [an egg case or mermaid's purse].