Referee's report by Henry Frederick Baker, on a paper 'Preliminary note on the operational invariants of a binary quantic' by Percy Alexander MacMahon Sectional Committee: Mathematics Not recommended for publication in the 'Philosophical Transactions of the Royal Society'. Refers to work of Alfred Clebsch. The paper would work as a 'Remarks' in the Proceedings of the Royal Society or the Proceedings of the London Mathematical Society, or the paper should be deferred until further investigations have been completed. [Published in the 'Proceedings of the Royal Society of London'] Endorsed on verso as received 13 November 1907. [November 1907]