 While he continued to get acquainted with Fitzroy, going shopping together, Darwin rushed around to arrange his supplies and equipment, getting advice from experts on specimen preservation such as William Yarrell at the Zoological Society of London, Robert Brown at the British Museum, Captain Phillip Parker King who led the first expedition, and invertebrate anatomist Robert Edmond Grant who had tutored Darwin at Edinburgh.Yarrell gave invaluable advice, and bargained with shopkeepers so Darwin paid £50 for two pistols and a rifle, while FitzRoy had spent £400 on firearms.On Sunday 11 September, FitzRoy and Darwin took the steam packet for Portsmouth.