Referee's report by Hans Friedrich Gadow, on a paper 'On the evolution of the vertebral column in birds, illustrated by its development in Larus and Struthio' by Johannes Piiper Sectional Committee: Zoology Recommended for publication in the 'Philosophical Transactions of the Royal Society'. Provides list of recommendations. As the paper contains so much that is new, some of which could be continuous, the paper should not be reduced. [Published in the Philosophical Transactions of the Royal Society B, 1928] Endorsed on verso as received 28 June 1927. [June 1927]