In 1858 he sent me a memoir on this subject, with a request that I would forward it to Sir Charles Lyell, who sent it to the Linnean Society, and it is published in the third volume of the Journal of that Society.
1858an txosten bat bidali zidan gai honi buruz, Sir Charles Lyell-i igor niezaion eskatuz, eta honek Linnean Society-ra bidali zuen, eta Elkarte honetako Journal-aren hirugarren liburukian argitaraturik dago.