Oleander, stock affected by grafting in the, i. 394.
Ollier, Dr., insertion of the periosteum of a dog beneath the skin of a rabbit, ii. [369].
Oncidium, reproduction of, ii. [133]-[135], [164].
Onions, crossing of, ii. [90];
white, liable to the attacks of fungi and disease, ii. [228], [336].
Ophrys apifera, self-fertilisation of, ii. [91];
formation of pollen by a petal in, ii. [392].
Opuntia leucotricha, ii. [277].
Orange, i. 334-336;
crossing of, ii. [91];