I have been very sorry that I have mislaid your last letter, received several months ago. I have searched it in vain until
I found it, by chance, to-day among some other papers.
I thank you for your reprints and for the returned duplicates of my publications, and I enclose a copy of one of the wanted
papers. The paper in Acta Path. 20 791 is an abstract from a meeting of which I have no reprints.