While developing this intensive study of transmutation, Darwin became mired in more work. Still rewriting his "Journal", he took on editing and publishing the expert reports on his collections, and with Henslow's help obtained a Treasury grant of £1,000 to sponsor this multi-volume "Zoology of the Voyage of H.M.S. Beagle", a sum equivalent to about £ in . He stretched the funding to include his planned books on geology, and agreed to unrealistic dates with the publisher. As the Victorian era began, Darwin pressed on with writing his "Journal", and in August 1837 began correcting printer's proofs.