Images of scientists including Sambucus, Say, Scaliger, Schelling, Schenck, Scherf, Schiaparelli, Schickard, Schleiden, Schlosser, Schmidt, Schrank, Schroder, Schwenter, Sebisch, Senart, Sennert, Severino, Seward, Siguad, Smeaton, Snellius, Sommering, Soner, Spener, Spinoza, Stahl, Stoffler, Storck, Swieten, Sylvester, Sylvius and others are available here.  Digitized by Mary Parker.