Royal Dublin Society, April 30. J. H. OBTON: The biological condition of re-laid oysters. Exceptionally high mortality had occurred amongst these oysters, but no disease was recognised, and their poor physiological condition and the presence of ‘chambering’ in the shells made it probable that the mortality was due to abnormal weather conditions. G. T. PYNE: A simple titrametric method for the approximate determination of milk phosphates. This method is suitable for the estimation of soluble and of total phosphates. J. BAYLEY BUTLER, J. CAKROLL and Miss KIBBY: The toxicity of native pyrethrum. Experiments show that pyrethrum prepared from Irish-grown plants approximates in toxicity to that obtained from plants grown in England, and exceeds that from most other sources.