Referee's report by James Alexander Murray, on a paper 'Experimental studies on the differentiation of embryonic tissues growing in vivo and in vitro.—I. The development of the undifferentiated limb-bud (a) when subcutaneously grafted into the post-embryonic chick and (b) when cultivated in vitro' by T S P Strangeways and Honor Bridget Fell Sectional Committee: Physiology Recommended for publication in the 'Proceedings of the Royal Society of London'. Suggests some additional illustrations. [Published in the 'Proceedings of the Royal Society of London' B, 1926] Endorsed on verso as received 3 June 1926. 2 June 1926