CD thanks BJS for photographs of Jemmy [Button]’s son

and for the curious case about stallions, which leads him to ask whether BJS has observed that horses when fighting try especially to bite each other’s necks.

Does he know anything about male seals fighting?

Asks for information on coloration and proportions of sexes in butterflies and moths for his work on sexual selection.

Wants to know how the colour of the eye of the peacock’s tail is produced, whether it depends upon colouring matter in the feathers or reflection, and whether any varying structural change will account for the series of colours surrounding it.