(1) The embryo epidermis, the plumule and the radicle tissues were never probed.(2) The second group includes down feathers, or plumules , which are softer and shorter than contour feathers.(3) Geese are larger than ducks so their down plumules are larger and typically geese from colder climates such as central and northern Europe have the largest plumules.(4) Radicles or plumules were excised from the embryos and similarly incubated.
