Referee's report by Peter Martin Duncan, on a paper 'On the nature and origin of the beds of chert in the upper carboniferous limestones of Ireland' by Edward Hull and E T Hardman Not recommended for publication in the 'Philosophical Transactions of the Royal Society'. The appendix contains important information. The paper is well suited for the Geological Society's publications. The paper does not deal with the subject in an original manner. The microscopic photographs can be omitted. Suggests a full abstract be printed in the Proceedings. Subject: Geology [Published in the 'Proceedings of the Royal Society of London', 1878] 30 May 1877