Referee's report by Edwin Ray Lankester, on a paper 'The effect of environment on the development of echinoderm larvae: an experimental inquiry into the causes of variation' by H M Vernon Not recommended for publication in the 'Philosophical Transactions of the Royal Society'. Does not consider the paper to be fully complete or conclusive. Recommends publication in the Proceedings of the Royal Society of London. The figures should be given as process blocks in the text. Suggests the author determine the range of variation in the larvae before the experiment has begun. Subject: Zoology [Published in the Philosophical Transactions of the Royal Society, 1895] 4 February 1895