Paper, 'Note to a memoir on the theory of mathematical form' by A B [Alfred Bray] Kempe Kempe writes: 'An interesting letter of criticism from Professor C S Peirce on my recently published Memoir on the Theory of Mathematical Form has led me to reconsider certain paragraphs therein, relating to the definition of what I have termed “aspects,” and I am anxious to make the following amendments. For Section 5 substitute— 5. In like manner some pairs of units are distinguished from each other, while others are not. Pairs may in some cases be distinguished even though the units composing them are not.' Annotations in pencil and ink. Subject: Mathematics Received 26 February 1887. Read 24 March 1887. A version of this paper was published in volume 42 of the Proceedings of the Royal Society as 'Note to a memoir on the theory of mathematical form (‘Phil. Trans.’ 1886 (vol. 177), p. 1)'. 25 February 1887