"Humic" Quotes from Famous Books
 ... think how you are sneering all this time.] It is not much of a difficulty, there not being shells with the coal, considering how unfavourable deep mud is for most Mollusca, and that shells would probably decay from the humic acid, as seems to take place in peat and in the BLACK moulds (as Lyell tells me) of the Mississippi. So coal ...
— The Life and Letters of Charles Darwin, Volume I • Francis Darwin |
