Printed in Great Britain ACTIVE TRANSPORT BY THE CECROPIA MIDGUT V. LOSS OF POTASSIUM TRANSPORT DURING LARVAL-PUPAL TRANSFORMATION

Few serious attempts have been made to study either alterations of active ion transport during ontogenic development or the developmental consequences of altered ion environments within and around cells (see Kroeger, 1966 and Harvey & Haskell, 1966 for references). Nevertheless, to cite but a few examples of the importance o