Thanks for new [6th] edition of Origin.

Is working on Echini.

The more material he gets the less easy it is to diagnose a genus or species. Has little doubt that "classification is nothing but the most arbitrary convenient tool, depending upon the material at our command at a special time".

Thanks for facts about ducks.

Thinks TCE will be converted to principle of evolution if he continues testing facts for and against it. Natural selection is another question.