Advancement of Science and in 1842 he was appointed one of eight original members of the Association's working party to consider if rules could be devised to govern zoological nomenclature on a uniform and permanent basis. The other such members were Charles Darwin, Hugh Strickland, John Stevens Henslow, Leonard Jenyns, John Westwood, John Richardson and John Phillips; further members were subsequently co-opted. When praising Ogilby's "Power of the Thumb" thesis in the pages of the Magazine of Natural History, Strickland had disagreed with some of its nomenclature. Ogilby responded in immoderate language, denouncing the alternatives proposed by Strickland as arbitrary, dogmatical, unfounded and unnecessary, whereupon Westwood entered the argument in favour of Strickland. Despite this unpromising backdrop, the Science Association's working party found considerable common ground. A first draft of a regulatory code prepared by Strickland was circulated in February 1842, Darwin marking it with his comments and forwarding it to Ogilby (both men's manuscript observations survive). The draft was then discussed and revised in meetings attended by Ogilby in April and May, and a second draft was printed for presentation at the Association's annual assembly at Manchester in June. The very existence of the working party attracted hostility at the assembly, notably from J. E. Gray, Keeper of Zoology at the British Museum, with whom Ogilby had a history of bickering over nomenclature. As a result Strickland's draft was not adopted in Manchester but, after further revision to reflect comment by members of the working party, was included in the group's report which was printed in the Science Association's Proceedings. These "Strickland Rules" included provision for the name of a species to be changed if, as applied to the object or group which it represented, its meaning transpired to be "false". Ogilby opposed such flexibility, believing that, once established, the name must remain constant although its application could change by convention. Words, he said, were no more than the expression of an idea and so long as there was agreement on the idea the original or literal meaning of the words encapsulating it had no importance. He, alone among the first members of the working party, declined to sign the report, but the rules which it promulgated attracted immediate international interest, were reprinted in French and Italian and recommended by foreign zoological societies to be followed by their members. They were the first attempt at an international code governing