Images of scientists including Galileo, Gall, Garnerus, Gassendi, Gauss, Gay-Lussac, Gehler, Geigerus, Gerson, Gesner, Gilbert, Girard, Gmelin, Goethals, Goldmayer, Graebe, Grataroli, Gravenhorst, Gray, Greathead, Greely, Gren, Guignard, Guinterius, Guyton and others are available here.  Digitized by Mary Parker.