Note 5 — Chapter II · HOMOLOGY AND ITS EVOLUTIONARY INTERPRETATION

This transitory lymphatic, or tracheal venation appearing in the appendages at the stenogastric stage may not have the particular significance that Father Wasmann assigns. Such venation, even if vestigial and aborted, need not necessarily be a vestige of former wing venation. To demonstrate the validity of the atavistic interpretation, all other possible interpretations would have to be definitively excluded.