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THE STRUCTURE OF THE FERTILISED EGG
POLARITY AND SYMMETRY THE CORTICAL
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abnormal acid activity amphiaster amphibians amputated animal pole anurans apical archenteron archenteron roof aster blastema blastomeres blastopore blastula caudal cell groups centre centrifuged chemical chemodifferentiation chromosomes cortical cortical reaction cristatus cytoplasm Dalcq determined developmental differentiation division dorsal ectoderm egg cytoplasm egg nucleus egg surface embryo endoderm experiments eye-cup eye-vesicle fertilisation fertilised egg fore-limb formation formed fusion gastrula genes germ gradient graft grey crescent halves harmoniously built host hybrids induction inductor influence invagination larvae later layer lens limb merogones mesenchyme mesoderm neural plate neurula newt normal development normal embryo notochord nuclear factors occur organ primordia organisation organisation-field original phenomena pigment cells planarian plasm polar lobe pole-plasm potency primordium processes produced pronuclei protein protoplasm regeneration bud region role rostral sea urchin sea urchin eggs skeleton so-called spatial multiplicity species Spemann sperm stage structure stump substances symmetry tail takes place tion tissue transplantation vegetative pole vesicle yolk