SIZE INDEPENDENT SECRETION BY CORPUS ALLATUM OF CALLIPHORA ERYTHROCEPHALA

There are cyclic changes in the size of the corpus allatum (CA): (1) during sugar-feeding following emergence, and (2) following the addition of meat to the diet. The CA of flies fed on sugar were always smaller than the CA of flies fed on meat. Our test for secretory activity of the CA was the effect of an implanted CA on the volume of the nuclei of the medial neurosecretory cells of an allatectomized host. The activity of the CA was not correlated with either the size of the gland or egg maturation. Inactive CA were activated after transplantation to a host which was fed on meat. © 1969.