Gives the results of crossing experiments; some interesting and curious facts.

Discusses poultry crosses, "what a hopelessly difficult subject is that of inheritance!" Gives details of some pigeon crosses he made; cannot positively recall which produced the blue bird.

Sends queries for "Fanciers"

and asks about the mating of the queen bee.

Asks whether crossing breeds of hive-bees is advantageous

and whether different pigeon breeds have different incubation periods.

Explains and apologises for the lack of detailed quotations in Origin.

Thanks for information on pigeon hatching

and on drones.

Believes occasional crosses indispensable.

Regrets he has nothing that he could contribute to the Field and cannot spare the time to work out anything on bees’ cells.