Sends boxes of Lake Geneva pebbles that CD requested.

Thanks HdS for pebbles of Roman bricks. When he goes over MS [Earthworms] again, he will compare smoother ones with those having undergone attrition in gizzards of worms.

Has received book [La question du lac] sent by HdS.

Also sends photograph taken by Leonard Darwin of CD.

Requests photograph of HdS to add to his collection.