Abstract
Glucosamine constitutes at least 0.6 percent of the Drosophila egg shell. Spectrographic analysis shows the presence of 18 elements. Calcium is most abundant, followed by sodium, phosphorus and iron. Magnesium, silicon, copper, aluminum, and barium come next while boron, nickel, tin, manganese, lead, strontium, zinc, and chromium are weakly indicated.