Responds to Davall's five letters [of 11 February 1791] and remarks further on plants sent by Davall on which their opinions differ. Thinks that Davall should either confide the Latin of his book to [Jacob] Wyttenbach, send his manuscript to [Samuel] Goodenough or himself, or communicate his findings in English to Linnean Society for second volume of "Linnean Transactions", so long as it appears in some form or other. Does not know 'Psora testacca' but Davall should keep it for his own work, as he would rather quote it from that to save himself trouble.