WSD is pleased that CD approves his index draft [for Variation]; notes his objection to long list of references under "Dogs" and will try to find a principle for shortening it. He has not indexed all authors’ names; is this practice satisfactory?

Thanks CD for his two notes [on indexing references to authors]; will increase the scope of his citations by including those quoted in footnotes in support of statements in the text.

Has adopted CD’s plan of giving every author’s name in index [of Variation], but it causes delay.