Referee's report by Andrew Russell Forsyth, on a paper 'On the differential covariants of plane curves, and the operators employed in their development' by R F Gwyther Recommended for publication in Philosophical Transactions. Before it is published, the author's attention should be called to the existence of a large amount of literature which contain results similar to his own, but to which he gives no reference. He should especially refer to Professor Sylvester's work. Subject: Mathematics [Published in Philosophical Transactions A, 1893]. 12 May 1893