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In 1882, a paper of mine “On a Class of Invariants ” appeared in the “Philosophical Transactions,” in which I used, for the determination of theorems, two classes of functions of the coefficients of linear differential equations. In consequence of a communication from the Rev. Robert Harley, I appended to the paper the following note:— “Since the publication of the abstract of this paper, the Rev. R. Harley has mentioned to me that the first class of functions treated of here have [has] been already investigated by Sir James Cockle; having consulted the memoirs I was referred to by Mr. Harley, I think little similarity will be found between Sir James Cockle’s results and mine.—J. C. M.”

II. Note on Rev. Robert Harley's paper, 'Professor Malet's classes of invariants identified with Sir James Cockle's criticoids