2 Mn tm Be ae
A ERIERSTRIE
DIFFERENTIATION OF GASTRULAS AND FEATHER GERMS1005
(yo
:
)
Fig. 6 —Seven-day-old chick embryo skin cultivated for 5 days.
(0) Irradiated with 1000 R (no feather germs),
(a) Control.
Fig. 7—Results of the reassociation of normal dermis and normal epidermis.
Magnification, 240%,
Cc a neAr en oe ae